Update app.py

app.py

@@ -147,7 +147,7 @@ def custom_auth():
     return JSONResponse({"token": token})
 
 @cl.on_chat_start
-def on_chat_start():
+async def on_chat_start():
     cl.user_session.set(
         "message_history",
         [{"role": "system", "content": "You are a helpful assistant."}],