Fix content

app.py

@@ -45,7 +45,7 @@ def model_chat(query: Optional[str], history: Optional[History]) -> Generator[Tu
     )
     messages.append({'role': 'assistant', 'content': ''})
     for completion in gen:
-        text = completion.choices[0].text
+        text = completion.choices[0].message.content
         messages[-1]['content'] += text
         history = messages_to_history(messages)
         yield '', history