diff --git a/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md b/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md
index 93b15ec6e6a50acab647ff278fdf130d35cab892..2bf2887ae5731418195485fa4532589498aa6281 100644
--- a/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md
+++ b/zh-cn/application-dev/reference/apis/js-apis-data-preferences.md
@@ -55,14 +55,14 @@ let preferences = null;
 try {
     data_preferences.getPreferences(context, 'mystore', function (err, val) {
         if (err) {
-            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
         preferences = val;
         console.info("Succeeded in getting preferences.");
     })
 } catch (err) {
-    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -78,14 +78,14 @@ class EntryAbility extends UIAbility {
         try {
             data_preferences.getPreferences(this.context, 'mystore', function (err, val) {
                 if (err) {
-                    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+                    console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
                     return;
                 }
                 preferences = val;
                 console.info("Succeeded in getting preferences.");
             })
         } catch (err) {
-            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -128,10 +128,10 @@ try {
         preferences = object;
         console.info("Succeeded in getting preferences.");
     }).catch((err) => {
-        console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -150,10 +150,10 @@ class EntryAbility extends UIAbility {
                 preferences = object;
                 console.info("Succeeded in getting preferences.");
             }).catch((err) => {
-                console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
             })
         } catch(err) {
-            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -197,14 +197,14 @@ let preferences = null;
 try {
     data_preferences.getPreferences(context, { name: 'mystore' }, function (err, val) {
         if (err) {
-            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
         preferences = val;
         console.info("Succeeded in getting preferences.");
     })
 } catch (err) {
-    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -221,14 +221,14 @@ class EntryAbility extends UIAbility {
         try {
             data_preferences.getPreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err, val) {
                 if (err) {
-                    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+                    console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
                     return;
                 }
                 preferences = val;
                 console.info("Succeeded in getting preferences.");
             })
         } catch (err) {
-            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -280,10 +280,10 @@ try {
         preferences = object;
         console.info("Succeeded in getting preferences.");
     }).catch((err) => {
-        console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -302,10 +302,10 @@ class EntryAbility extends UIAbility {
                 preferences = object;
                 console.info("Succeeded in getting preferences.");
             }).catch((err) => {
-                console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
             })
         } catch(err) {
-            console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -350,13 +350,13 @@ let context = featureAbility.getContext();
 try {
     data_preferences.deletePreferences(context, 'mystore', function (err) {
         if (err) {
-            console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in deleting preferences." );
     })
 } catch (err) {
-    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -370,13 +370,13 @@ class EntryAbility extends UIAbility {
         try {
             data_preferences.deletePreferences(this.context, 'mystore', function (err) {
                 if (err) {
-                    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+                    console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
                     return;
                 }
                 console.info("Succeeded in deleting preferences." );
             })
         } catch (err) {
-            console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -427,10 +427,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in deleting preferences.");
     }).catch((err) => {
-        console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -446,10 +446,10 @@ class EntryAbility extends UIAbility {
             promise.then(() => {
                 console.info("Succeeded in deleting preferences.");
             }).catch((err) => {
-                console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
             })
         } catch(err) {
-            console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -495,13 +495,13 @@ let context = featureAbility.getContext();
 try {
     data_preferences.deletePreferences(context, { name: 'mystore' }, function (err) {
         if (err) {
-            console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in deleting preferences." );
     })
 } catch (err) {
-    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -515,13 +515,13 @@ class EntryAbility extends UIAbility {
         try {
             data_preferences.deletePreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err) {
                 if (err) {
-                    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+                    console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
                     return;
                 }
                 console.info("Succeeded in deleting preferences." );
             })
         } catch (err) {
-            console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -575,10 +575,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in deleting preferences.");
     }).catch((err) => {
-        console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -594,10 +594,10 @@ class EntryAbility extends UIAbility {
             promise.then(() => {
                 console.info("Succeeded in deleting preferences.");
             }).catch((err) => {
-                console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
             })
         } catch(err) {
-            console.info("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to delete preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -635,13 +635,13 @@ let context = featureAbility.getContext();
 try {
     data_preferences.removePreferencesFromCache(context, 'mystore', function (err) {
         if (err) {
-            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in removing preferences.");
     })
 } catch (err) {
-    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -655,13 +655,13 @@ class EntryAbility extends UIAbility {
         try {
             data_preferences.removePreferencesFromCache(this.context, 'mystore', function (err) {
                 if (err) {
-                    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+                    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
                     return;
                 }
                 console.info("Succeeded in removing preferences.");
             })
         } catch (err) {
-            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -705,10 +705,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in removing preferences.");
     }).catch((err) => {
-        console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -724,10 +724,10 @@ class EntryAbility extends UIAbility {
             promise.then(() => {
                 console.info("Succeeded in removing preferences.");
             }).catch((err) => {
-                console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             })
         } catch(err) {
-            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -763,7 +763,7 @@ let context = featureAbility.getContext();
 try {
     data_preferences.removePreferencesFromCacheSync(context, 'mystore');
 } catch(err) {
-    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -777,7 +777,7 @@ class EntryAbility extends UIAbility {
         try {
             data_preferences.removePreferencesFromCacheSync(this.context, 'mystore');
         } catch(err) {
-            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -823,13 +823,13 @@ let context = featureAbility.getContext();
 try {
     data_preferences.removePreferencesFromCache(context, { name: 'mystore' }, function (err) {
         if (err) {
-            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in removing preferences.");
     })
 } catch (err) {
-    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -843,13 +843,13 @@ class EntryAbility extends UIAbility {
         try {
             data_preferences.removePreferencesFromCache(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err) {
                 if (err) {
-                    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+                    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
                     return;
                 }
                 console.info("Succeeded in removing preferences.");
             })
         } catch (err) {
-            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -902,10 +902,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in removing preferences.");
     }).catch((err) => {
-        console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -921,10 +921,10 @@ class EntryAbility extends UIAbility {
             promise.then(() => {
                 console.info("Succeeded in removing preferences.");
             }).catch((err) => {
-                console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             })
         } catch(err) {
-            console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
         }
     }
 }
@@ -970,13 +970,13 @@ get(key: string, defValue: ValueType, callback: AsyncCallback<ValueType>):
 try {
     preferences.get('startup', 'default', function (err, val) {
         if (err) {
-            console.info("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in getting value of 'startup'. val： " + val);
     })
 } catch (err) {
-    console.info("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1010,10 +1010,10 @@ try {
     promise.then((data) => {
         console.info("Succeeded in getting value of 'startup'. Data: " + data);
     }).catch((err) => {
-        console.info("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1045,7 +1045,7 @@ try {
     let value = preferences.getSync('startup', 'default');
     console.info("Succeeded in getting value of 'startup'. Data: " + value);
 } catch(err) {
-    console.info("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get value of 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1069,7 +1069,7 @@ getAll(callback: AsyncCallback<Object>): void;
 try {
     preferences.getAll(function (err, value) {
         if (err) {
-            console.info("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
             return;
         }
     let allKeys = Object.keys(value);
@@ -1077,7 +1077,7 @@ try {
     console.info("getAll object = " + JSON.stringify(value));
     })
 } catch (err) {
-    console.info("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1106,10 +1106,10 @@ try {
         console.info('getAll keys = ' + allKeys);
         console.info("getAll object = " + JSON.stringify(value));
     }).catch((err) => {
-        console.info("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
     })
 } catch (err) {
-    console.info("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1136,7 +1136,7 @@ try {
     console.info('getAll keys = ' + allKeys);
     console.info("getAll object = " + JSON.stringify(value));
 } catch (err) {
-    console.info("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to get all key-values. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1162,13 +1162,13 @@ put(key: string, value: ValueType, callback: AsyncCallback<void>): void
 try {
     preferences.put('startup', 'auto', function (err) {
         if (err) {
-            console.info("Failed to put value of 'startup'. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to put value of 'startup'. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in putting value of 'startup'.");
     })
 } catch (err) {
-    console.info("Failed to put value of 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to put value of 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1202,10 +1202,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in putting value of 'startup'.");
     }).catch((err) => {
-        console.info("Failed to put value of 'startup'. code =" + err.code +", message =" + err.message);
+        console.error("Failed to put value of 'startup'. code =" + err.code +", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to put value of 'startup'. code =" + err.code +", message =" + err.message);
+    console.error("Failed to put value of 'startup'. code =" + err.code +", message =" + err.message);
 }
 ```
 
@@ -1231,7 +1231,7 @@ putSync(key: string, value: ValueType): void
 try {
     preferences.putSync('startup', 'auto');
 } catch(err) {
-    console.info("Failed to put value of 'startup'. code =" + err.code +", message =" + err.message);
+    console.error("Failed to put value of 'startup'. code =" + err.code +", message =" + err.message);
 }
 ```
 
@@ -1257,7 +1257,7 @@ has(key: string, callback: AsyncCallback<boolean>): void
 try {
     preferences.has('startup', function (err, val) {
         if (err) {
-            console.info("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
             return;
         }
         if (val) {
@@ -1267,7 +1267,7 @@ try {
         }
   })
 } catch (err) {
-    console.info("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1304,10 +1304,10 @@ try {
             console.info("The key 'startup' dose not contain.");
         }
     }).catch((err) => {
-        console.info("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
   })
 } catch(err) {
-    console.info("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1343,7 +1343,7 @@ try {
         console.info("The key 'startup' dose not contain.");
     }
 } catch(err) {
-    console.info("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to check the key 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1369,13 +1369,13 @@ delete(key: string, callback: AsyncCallback<void>): void
 try {
     preferences.delete('startup', function (err) {
         if (err) {
-            console.info("Failed to delete the key 'startup'. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to delete the key 'startup'. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in deleting the key 'startup'.");
     })
 } catch (err) {
-    console.info("Failed to delete the key 'startup'. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to delete the key 'startup'. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1408,10 +1408,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in deleting the key 'startup'.");
     }).catch((err) => {
-        console.info("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
+        console.error("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
+    console.error("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
 }
 ```
 
@@ -1436,7 +1436,7 @@ deleteSync(key: string): void
 try {
     preferences.deleteSync('startup');
 } catch(err) {
-    console.info("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
+    console.error("Failed to delete the key 'startup'. code =" + err.code +", message =" + err.message);
 }
 ```
 
@@ -1461,13 +1461,13 @@ flush(callback: AsyncCallback<void>): void
 try {
     preferences.flush(function (err) {
         if (err) {
-            console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in flushing.");
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1494,10 +1494,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in flushing.");
     }).catch((err) => {
-        console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1522,13 +1522,13 @@ clear(callback: AsyncCallback<void>): void
 try {
     preferences.clear(function (err) {
         if (err) {
-            console.info("Failed to clear. code =" + err.code + ", message =" + err.message);
+            console.error("Failed to clear. code =" + err.code + ", message =" + err.message);
             return;
         }
         console.info("Succeeded in clearing.");
     })
 } catch (err) {
-    console.info("Failed to clear. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to clear. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1555,10 +1555,10 @@ try {
     promise.then(() => {
         console.info("Succeeded in clearing.");
     }).catch((err) => {
-        console.info("Failed to clear. code =" + err.code + ", message =" + err.message);
+        console.error("Failed to clear. code =" + err.code + ", message =" + err.message);
     })
 } catch(err) {
-    console.info("Failed to clear. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to clear. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1577,7 +1577,7 @@ clearSync(): void
 try {
     preferences.clearSync();
 } catch(err) {
-    console.info("Failed to clear. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to clear. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1603,7 +1603,7 @@ on(type: 'change', callback: Callback<{ key : string }>): void
 try {
     data_preferences.getPreferences(this.context, 'mystore', function (err, preferences) {
         if (err) {
-            console.info("Failed to get preferences.");
+            console.error("Failed to get preferences.");
             return;
         }
         let observer = function (key) {
@@ -1612,14 +1612,14 @@ try {
         preferences.on('change', observer);
         preferences.put('startup', 'manual', function (err) {
             if (err) {
-                console.info("Failed to put the value of 'startup'. Cause: " + err);
+                console.error("Failed to put the value of 'startup'. Cause: " + err);
                 return;
             }
             console.info("Succeeded in putting the value of 'startup'.");
 
             preferences.flush(function (err) {
                 if (err) {
-                    console.info("Failed to flush. Cause: " + err);
+                    console.error("Failed to flush. Cause: " + err);
                     return;
                 }
                 console.info("Succeeded in flushing.");
@@ -1627,7 +1627,7 @@ try {
         })
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1662,7 +1662,7 @@ on(type: 'multiProcessChange', callback: Callback<{ key : string }>): void
 try {
     data_preferences.getPreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err, preferences) {
         if (err) {
-            console.info("Failed to get preferences.");
+            console.error("Failed to get preferences.");
             return;
         }
         let observer = function (key) {
@@ -1671,14 +1671,14 @@ try {
         preferences.on('multiProcessChange', observer);
         preferences.put('startup', 'manual', function (err) {
             if (err) {
-                console.info("Failed to put the value of 'startup'. Cause: " + err);
+                console.error("Failed to put the value of 'startup'. Cause: " + err);
                 return;
             }
             console.info("Succeeded in putting the value of 'startup'.");
 
             preferences.flush(function (err) {
                 if (err) {
-                    console.info("Failed to flush. Cause: " + err);
+                    console.error("Failed to flush. Cause: " + err);
                     return;
                 }
                 console.info("Succeeded in flushing.");
@@ -1686,7 +1686,7 @@ try {
         })
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1696,7 +1696,7 @@ try {
 try {
     data_preferences.getPreferences(this.context, { name: 'mystore' }, function (err, val) {
         if (err) {
-            console.info("Failed to get preferences.");
+            console.error("Failed to get preferences.");
             return;
         }
         preferences = val;
@@ -1705,40 +1705,40 @@ try {
             try {
                 data_preferences.removePreferencesFromCache(this.context, { name: 'mystore' }, function (err) {
                     if (err) {
-                        console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+                        console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
                         return;
                     }
                     preferences = null;
                     console.info("Succeeded in removing preferences.");
                 })
             } catch (err) {
-                console.info("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to remove preferences. code =" + err.code + ", message =" + err.message);
             }
 
             try {
                 data_preferences.getPreferences(this.context, { name: 'mystore' }, function (err, val) {
                     if (err) {
-                        console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+                        console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
                         return;
                     }
                     preferences = val;
                     console.info("Succeeded in getting preferences.");
                 })
             } catch (err) {
-                console.info("Failed to get preferences. code =" + err.code + ", message =" + err.message);
+                console.error("Failed to get preferences. code =" + err.code + ", message =" + err.message);
             }
         }
         preferences.on('multiProcessChange', observer);
         preferences.put('startup', 'manual', function (err) {
             if (err) {
-                console.info("Failed to put the value of 'startup'. Cause: " + err);
+                console.error("Failed to put the value of 'startup'. Cause: " + err);
                 return;
             }
             console.info("Succeeded in putting the value of 'startup'.");
 
             preferences.flush(function (err) {
                 if (err) {
-                    console.info("Failed to flush. Cause: " + err);
+                    console.error("Failed to flush. Cause: " + err);
                     return;
                 }
                 console.info("Succeeded in flushing.");
@@ -1746,7 +1746,7 @@ try {
         })
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1771,7 +1771,7 @@ off(type: 'change', callback?: Callback<{ key : string }>): void
 try {
     data_preferences.getPreferences(this.context, 'mystore', function (err, preferences) {
         if (err) {
-            console.info("Failed to get preferences.");
+            console.error("Failed to get preferences.");
             return;
         }
         let observer = function (key) {
@@ -1780,14 +1780,14 @@ try {
         preferences.on('change', observer);
         preferences.put('startup', 'auto', function (err) {
             if (err) {
-                console.info("Failed to put the value of 'startup'. Cause: " + err);
+                console.error("Failed to put the value of 'startup'. Cause: " + err);
                 return;
             }
             console.info("Succeeded in putting the value of 'startup'.");
 
             preferences.flush(function (err) {
                 if (err) {
-                    console.info("Failed to flush. Cause: " + err);
+                    console.error("Failed to flush. Cause: " + err);
                     return;
                 }
                 console.info("Succeeded in flushing.");
@@ -1796,7 +1796,7 @@ try {
         })
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
 }
 ```
 
@@ -1821,7 +1821,7 @@ off(type: 'multiProcessChange', callback?: Callback<{ key : string }>): vo
 try {
     data_preferences.getPreferences(this.context, { name: 'mystore', dataGroupId:'myId' }, function (err, preferences) {
         if (err) {
-            console.info("Failed to get preferences.");
+            console.error("Failed to get preferences.");
             return;
         }
         let observer = function (key) {
@@ -1830,14 +1830,14 @@ try {
         preferences.on('multiProcessChange', observer);
         preferences.put('startup', 'auto', function (err) {
             if (err) {
-                console.info("Failed to put the value of 'startup'. Cause: " + err);
+                console.error("Failed to put the value of 'startup'. Cause: " + err);
                 return;
             }
             console.info("Succeeded in putting the value of 'startup'.");
 
             preferences.flush(function (err) {
                 if (err) {
-                    console.info("Failed to flush. Cause: " + err);
+                    console.error("Failed to flush. Cause: " + err);
                     return;
                 }
                 console.info("Succeeded in flushing.");
@@ -1846,7 +1846,7 @@ try {
         })
     })
 } catch (err) {
-    console.info("Failed to flush. code =" + err.code + ", message =" + err.message);
+    console.error("Failed to flush. code =" + err.code + ", message =" + err.message);
 }
 ```
 ## ValueType