Update app.py

app.py

@@ -12,7 +12,8 @@ from langchain_openai import ChatOpenAI
 from langchain_community.agent_toolkits import create_sql_agent
 from huggingface_hub import InferenceClient
 from langgraph.graph import StateGraph, END
-from langgraph.prebuilt.tool_executor import ToolExecutor, ToolInvocation
+from langgraph.prebuilt import ToolExecutor, ToolInvocation
+from langchain_core.tools import tool
 from langgraph.checkpoint.sqlite import SqliteSaver
 from langchain.agents import tool
 import gradio as gr