diff --git a/assets/wechat.jpg b/assets/wechat.jpg
index e15b95293..cfc353527 100644
Binary files a/assets/wechat.jpg and b/assets/wechat.jpg differ
diff --git a/dbgpt/agent/agents/expand/plugin_assistant_agent.py b/dbgpt/agent/agents/expand/plugin_assistant_agent.py
index d1ad50ec0..aab0cff33 100644
--- a/dbgpt/agent/agents/expand/plugin_assistant_agent.py
+++ b/dbgpt/agent/agents/expand/plugin_assistant_agent.py
@@ -54,8 +54,8 @@ class PluginAssistantAgent(ConversableAgent):
             if item.type == ResourceType.Plugin:
                 item_list.append(item.value)
         self.plugin_generator = await plugin_loader_client.a_load_plugin(
-                    item_list, self.plugin_generator
-                )
+            item_list, self.plugin_generator
+        )
 
     def prepare_act_param(self) -> Optional[Dict]:
         return {"plugin_generator": self.plugin_generator}
diff --git a/dbgpt/rag/knowledge/url.py b/dbgpt/rag/knowledge/url.py
index aaeb74956..38670463b 100644
--- a/dbgpt/rag/knowledge/url.py
+++ b/dbgpt/rag/knowledge/url.py
@@ -26,7 +26,7 @@ class URLKnowledge(Knowledge):
             encoding(str, optional): csv encoding
             loader(Any, optional): loader
         """
-        self._path = url
+        self._path = url or None
         self._type = knowledge_type
         self._loader = loader
         self._encoding = encoding
@@ -39,8 +39,12 @@ class URLKnowledge(Knowledge):
         else:
             from langchain.document_loaders import WebBaseLoader
 
-            web_reader = WebBaseLoader(web_path=self._path)
-            documents = web_reader.load()
+            if self._path is not None:
+                web_reader = WebBaseLoader(web_path=self._path)
+                documents = web_reader.load()
+            else:
+                # Handle the case where self._path is None
+                raise ValueError("web_path cannot be None")
         return [Document.langchain2doc(lc_document) for lc_document in documents]
 
     @classmethod