diff --git a/metagpt/tools/functions/libs/udf/__init__.py b/metagpt/tools/functions/libs/udf/__init__.py
index 3c4e72d8b..add03f376 100644
--- a/metagpt/tools/functions/libs/udf/__init__.py
+++ b/metagpt/tools/functions/libs/udf/__init__.py
@@ -76,7 +76,7 @@ def docstring_to_yaml(docstring: str, return_vars: List[str] = None):
     if not params:
         err_msg = f"No Args found in docstring as following, Please make sure it is google style\
             : \n\n{'-'*60}\n{docstring}\n{'-'*60}\n\n."
-        logger.error(err_msg)
+        logger.warning(err_msg)
         params = ((None, None, None),)
     # 匹配Returns部分
     returns_match = re.search(r'Returns:\s*(.*?)(?:Raises:|$)', docstring, re.DOTALL)