Update backend/query_llm.py

backend/query_llm.py

@@ -109,7 +109,7 @@ def generate_qwen(formatted_prompt: str, history: str):
     response = client.predict(
                     query=formatted_prompt,
                     history=[],
-                    system='You are wonderful'
+                    system='You are wonderful',
                     api_name="/model_chat"
                 )
     print('Response:',response)