Update app.py

app.py

@@ -167,15 +167,11 @@ async def handle_message(message: cl.Message):
 
         
         response = await post_tool.ainvoke(
-            json.dumps(post_data)
-            [cl.AsyncLangchainCallbackHandler()]
+            post_data,
+            config={"callbacks": [cl.AsyncLangchainCallbackHandler()]}
+            
         )
 
-        #response = await post_tool.ainvoke(
-            #post_data,
-            #[cl.AsyncLangchainCallbackHandler()]
-        #)
-        
         if response:
 
         #await cl.Message(content=str(response)).send()