Update app.py

app.py

@@ -26,8 +26,8 @@ from langchain.memory import ConversationBufferMemory
 from langchain.chains import ConversationalRetrievalChain
 
 
-from langchain.llms import HuggingFaceHub
-
+#  from langchain.llms import HuggingFaceHub
+from langchain_community.llms import HuggingFaceHub
 
 def get_pdf_text(pdf_docs):
     text = ""