Update app.py

app.py

@@ -126,7 +126,7 @@ orchestrator = AssistantAgent(
 )
 
 group_chat = GroupChat(
-    agents=[food_recognizer, size_estimator, nutrition_fetcher, advice_agent, orchestrator],
+    agents=[food_recognizer, size_estimator, nutrition_fetcher, orchestrator],
     messages=[],
     max_round=10
 )