Update app.py

app.py

@@ -111,7 +111,7 @@ logger = logging.getLogger(__name__)
 #             logger.error(f"Agent failed to generate response: {e}")
 #             raise
  # from langgraph.gr import StateGraph, END
-from langgraph import StateGraph, END
+from langgraph.graph import StateGraph, END
 from langchain_core.messages import HumanMessage, AIMessage
 from langchain_openai import AzureChatOpenAI
 from langchain_community.tools import WikipediaQueryRun, DuckDuckGoSearchRun