Update app.py

app.py

@@ -11,7 +11,7 @@ import tempfile
 from PyPDF2 import PdfReader, PdfWriter
 
 
-from langchain_community.chains import LLMChain, RetrievalQA
+from langchain.chains import LLMChain, RetrievalQA
 from langchain.document_loaders import PyPDFLoader,  UnstructuredWordDocumentLoader, DirectoryLoader
 from langchain.document_loaders.blob_loaders.youtube_audio import YoutubeAudioLoader
 #from langchain.document_loaders import GenericLoader