diff --git a/apps/common/handle/handle_exception.py b/apps/common/handle/handle_exception.py
index 272588c56..dfe2496ab 100644
--- a/apps/common/handle/handle_exception.py
+++ b/apps/common/handle/handle_exception.py
@@ -55,18 +55,22 @@ def validation_error_to_result(exc: ValidationError):
         return result.error(str(exc.detail))
 
 
-def find_err_detail(exc_detail: Dict):
+def find_err_detail(exc_detail):
+    if isinstance(exc_detail, ErrorDetail):
+        return exc_detail
     if isinstance(exc_detail, dict):
         keys = exc_detail.keys()
         for key in keys:
             _value = exc_detail[key]
             if isinstance(_value, list):
-                for v in _value:
-                    return v
+                return find_err_detail(_value)
             elif isinstance(_value, ErrorDetail):
                 return _value
             elif isinstance(_value, dict):
                 return find_err_detail(_value)
+    if isinstance(exc_detail, list):
+        for v in exc_detail:
+            return find_err_detail(v)
 
 
 def handle_exception(exc, context):
diff --git a/apps/dataset/serializers/paragraph_serializers.py b/apps/dataset/serializers/paragraph_serializers.py
index db0c5cef8..4bafcabd1 100644
--- a/apps/dataset/serializers/paragraph_serializers.py
+++ b/apps/dataset/serializers/paragraph_serializers.py
@@ -41,7 +41,7 @@ class ParagraphInstanceSerializer(ApiMixin, serializers.Serializer):
                                     min_length=1,
                                     allow_null=True, allow_blank=True)
 
-    title = serializers.CharField(required=False, error_messages=ErrMessage.char("段落标题"),
+    title = serializers.CharField(required=False, max_length=256, error_messages=ErrMessage.char("段落标题"),
                                   allow_null=True, allow_blank=True)
 
     problem_list = ProblemInstanceSerializer(required=False, many=True)
diff --git a/apps/dataset/serializers/problem_serializers.py b/apps/dataset/serializers/problem_serializers.py
index 6d6af97b5..449d6e814 100644
--- a/apps/dataset/serializers/problem_serializers.py
+++ b/apps/dataset/serializers/problem_serializers.py
@@ -33,7 +33,7 @@ class ProblemSerializer(serializers.ModelSerializer):
 class ProblemInstanceSerializer(ApiMixin, serializers.Serializer):
     id = serializers.CharField(required=False, error_messages=ErrMessage.char("问题id"))
 
-    content = serializers.CharField(required=True, error_messages=ErrMessage.char("问题内容"))
+    content = serializers.CharField(required=True, max_length=256, error_messages=ErrMessage.char("问题内容"))
 
     @staticmethod
     def get_request_body_api():