Update app.py

app.py

@@ -272,7 +272,7 @@ class BasicAgent:
         print(f"Agent received question (first 50 chars): {question[:50]}...")
         # Wrap the question in a HumanMessage from langchain_core
         messages = [HumanMessage(content=question)]
-        messages = self.graph.invoke({"messages": messages})
+        messages = self.invoke({"messages": messages})
         answer = messages['messages'][-1].content
         return answer[14:]