Update app.py

app.py

@@ -118,7 +118,7 @@ async def handle_message(message: cl.Message):
         except requests.exceptions.RequestException as e:
             await cl.Message(content=f"Request failed: {str(e)}").send()
     else:
-        response = await llm_chain.ainvoke(user_message, callbacks=[cl.AsyncLangchainCallbackHandler()])
+        response = await llm_chain.ainvoke(user_message)
 
 
     response_key = "output" if "output" in response else "text"