fix bug of serving (#1042)

paddlehub/commands/serving.py

@@ -166,7 +166,7 @@ class ServingCommand:
         '''
         Start one PaddleHub-Serving instance by arguments with gunicorn.
         '''
-        module = self.args.modules
+        module = self.modules_info
         if module is not None:
             port = self.args.port
             if is_port_occupied("127.0.0.1", port) is True:
@@ -209,7 +209,7 @@ class ServingCommand:
         '''
         Start one PaddleHub-Serving instance by arguments with flask.
         '''
-        module = self.args.modules
+        module = self.modules_info
         if module is not None:
             port = self.args.port
             if is_port_occupied("127.0.0.1", port) is True:

paddlehub/serving/app_compat.py

@@ -87,7 +87,7 @@ def predict_v2(module_info: dict, input: dict):
         output = serving_method(**predict_args)
     except Exception as err:
         log.logger.error(traceback.format_exc())
-        return package_result("101", err, "")
+        return package_result("101", str(err), "")
 
     return package_result("000", "", output)