Update app.py

app.py

@@ -1,7 +1,7 @@
 import streamlit as st
 from dotenv import load_dotenv
 from PyPDF2 import PdfReader
-from langchain_text_splitters import CharacterTextSplitter
+from langchain.text_splitter import RecursiveCharacterTextSplitter
 #from langchain_community.embeddings import HuggingFaceInstructEmbeddings
 #from langchain_community.vectorstores import FAISS 
 #from langchain.memory import ConversationBufferMemory