trying to fix returning the result

app.py

@@ -150,8 +150,8 @@ def chat_fn(message, history):
         )
     result_str = str(result)
     history = history + [(message, result_str)]
-    # ChatInterface expects (assistant_message, updated_history)
-    return result_str, history
+    # ChatInterface expects (assistant_message)
+    return result_str
 
 
 demo = gr.ChatInterface(fn=chat_fn, title="SmolAgents News & Tools Agent")