Update app.py

app.py

@@ -4,7 +4,7 @@ from langchain.document_loaders.csv_loader import CSVLoader
 from langchain.text_splitter import RecursiveCharacterTextSplitter
 from langchain.embeddings import HuggingFaceEmbeddings
 from langchain.vectorstores import FAISS
-from langchain.llms import CTransformers
+from langchain_community.llms import CTransformers
 from langchain.chains import ConversationalRetrievalChain
 
 def add_vertical_space(spaces=1):