Update app.py

app.py

@@ -75,7 +75,7 @@ async def echo(message, history, state, persona, use_generated_summaries):
             user_message_parts = [types.Part.from_text(text=message['text'])]
             if attached_file: user_message_parts.append(attached_file)
             user_message = [types.Content(role='user', parts=user_message_parts)]
-            state['messages'] = model_contents + user_message
+            state['messages'] = state['messages'] + user_message
 
             model_content_stream = await client.models.generate_content_stream(
                 model=args.model, 
@@ -86,7 +86,7 @@ async def echo(message, history, state, persona, use_generated_summaries):
         user_message_parts = [types.Part.from_text(text=message['text'])]
         if attached_file: user_message_parts.append(attached_file)
         user_message = [types.Content(role='user', parts=user_message_parts)]
-        state['messages'] = model_contents + user_message
+        state['messages'] = state['messages'] + user_message
 
         model_content_stream = await client.models.generate_content_stream(
             model=args.model,