Update app.py

app.py

@@ -3,7 +3,7 @@ import gradio as gr
 from langchain_community.vectorstores import FAISS
 from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain_community.document_loaders import PyMuPDFLoader
-from langchain.text_splitter import CharacterTextSplitter
+from langchain_text_splitters import CharacterTextSplitter
 from langchain.chains import RetrievalQA
 from langchain_community.llms import HuggingFaceHub
 from huggingface_hub import login