Update app.py

app.py

@@ -10,7 +10,6 @@ from crewai.tools import tool
 from langchain_groq import ChatGroq
 from langchain_openai import ChatOpenAI
 from langchain.schema.output import LLMResult
-from langchain_core.callbacks.base import BaseCallbackHandler
 from langchain_community.tools.sql_database.tool import (
     InfoSQLDatabaseTool,
     ListSQLDatabaseTool,