Update app.py

app.py

@@ -4,7 +4,8 @@ from langchain.embeddings.openai import OpenAIEmbeddings
 from langchain_community.vectorstores import MongoDBAtlasVectorSearch
 # error since Jan 2024, from langchain.document_loaders import DirectoryLoader
 from langchain_community.document_loaders import DirectoryLoader
-from langchain.llms import OpenAI
+# error since Jan 2024, from langchain.llms import OpenAI
+from langchain_community.llms import OpenAI
 from langchain.chains import RetrievalQA
 import gradio as gr
 from gradio.themes.base import Base