add and update docs (11852)

Signed-off-by: Nesterzhou <ester.zhou@huawei.com>

en/application-dev/reference/apis/js-apis-system-parameterV9.md

@@ -7,7 +7,7 @@ For details about the system parameter design principles and definitions, see
 > **NOTE**
 > - The initial APIs of this module are supported since API version 9. Newly added APIs will be marked with a superscript to indicate their earliest API version.
 > - The APIs provided by this module are system APIs.
-> - Third-party applications cannot use the APIs provided by this module, because system parameters each require specific discretionary access control (DAC) and MAC permissions.
+> - Third-party applications cannot use the APIs provided by this module, because system parameters each require specific discretionary access control (DAC) and mandatory access control (MAC) permissions.
 
 ## Modules to Import
 

en/application-dev/reference/errorcodes/errorcode-request.md

+# Upload and Download Error Codes
+
+## 13400001 File Operation Error
+
+**Error Message**
+
+File operation error.
+
+**Description**
+
+This error code is reported when a file operation error occurs in invoking the **uploadFile** or **downloadFile** API.
+
+**Possible Causes**
+
+The file permission is insufficient.
+
+**Solution**
+
+Make sure you have the required permission on the target files.
+
+## 13400002 File Path Error
+
+**Error Message**
+
+Bad file path.
+
+**Description**
+
+This error code is reported when a file path error occurs in invoking the **uploadFile** or **downloadFile** API.
+
+**Possible Causes**
+
+The file path is incorrect.
+
+**Solution**
+
+Verify the file path.
+
+## 13400003 Service Error
+
+**Error Message**
+
+Task manager service error.
+
+**Description**
+
+This error code is reported when a task manager service error occurs in invoking the **downloadFile** API.
+
+**Possible Causes**
+
+The task fails to be created.
+
+**Solution**
+
+Verify the task settings.

en/application-dev/reference/errorcodes/errorcode-system-parameterV9.md

+# System Parameter Error Codes
+
+## 14700101 Failure to Query the System Parameter
+
+**Error Message**
+
+System parameter can not be found.
+
+**Description**
+
+This error code is reported when the parameter does not exist in the workspace or no key has been set for the parameter.
+
+**Possible Causes**
+
+The parameter is not set or fails to be set.
+
+**Solution**
+
+Set the parameter correctly.
+
+## 14700102 Invalid System Parameter Value
+
+**Error Message**
+
+System parameter value is invalid.
+
+**Description**
+
+This error code is reported when the value of the system parameter is invalid.
+
+**Possible Causes**
+
+The value of the system parameter is empty, is out of range, or contains special characters, for example, "const..param.xxx".
+
+**Solution**
+
+Set the value to a valid string.
+
+## 14700103 Permission Denial for the Operation on the System Permission
+
+**Error Message**
+
+System permission operation permission denied.
+
+**Description**
+
+This error code is reported when the system parameter does not have the discretionary access control (DAC) or mandatory access control (MAC) permission.
+
+**Possible Causes**
+
+The DAC or MAC permission is not configured.
+
+**Solution**
+
+Add the DAC or MAC permission as needed.
+
+## 14700104 Internal System Error, Including Out of Memory and Deadlock
+
+**Error Message**
+
+System internal error including out of memory, deadlock etc.
+
+**Description**
+
+This error code is reported when the attempt to modify the **const** attribute settings, the socket connection, or the memory copy fails.
+
+**Possible Causes**
+
+The socket connection is abnormal, or the node fails to be added or obtained.
+
+**Solution**
+
+1. Analyze the memory usage of the entire process and eliminate memory leak.
+2. If you are in a multi-thread scenario, check the error stack for deadlock.