Update chain_app.py

chain_app.py

@@ -996,6 +996,7 @@ async def main(message: cl.Message):
         ).send()
 
     elif chat_profile == 'Qwen2-57B':
+        client = Client("Qwen/Qwen2-57b-a14b-instruct-demo")
         result = client.predict(
 		query=message.content,
 		history=[],