Update app.py

app.py

@@ -2,7 +2,8 @@ from pymongo import MongoClient
 from langchain.embeddings.openai import OpenAIEmbeddings
 # error since Jan 2024, from langchain.vectorstores import MongoDBAtlasVectorSearch
 from langchain_community.vectorstores import MongoDBAtlasVectorSearch
-from langchain.document_loaders import DirectoryLoader
+# error since Jan 2024, from langchain.document_loaders import DirectoryLoader
+from langchain_community.document_loaders import DirectoryLoader
 from langchain.llms import OpenAI
 from langchain.chains import RetrievalQA
 import gradio as gr