Update app.py

app.py

@@ -18,6 +18,7 @@ from langchain.agents import initialize_agent, Tool
 from langchain.text_splitter import RecursiveCharacterTextSplitter, CharacterTextSplitter
 from langchain.agents import Tool, AgentExecutor, create_react_agent, tool
 from flask import Flask, request, jsonify
+import chromadb
 import sqlite3
 import re
 import textwrap