Update app.py

app.py

@@ -8,7 +8,7 @@ from bs4 import BeautifulSoup
 # ---- LangChain Community Packages ----
 from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain_community.vectorstores import FAISS
-from langchain_community.chains import RetrievalQAWithSourcesChain
+from langchain.chains import RetrievalQAWithSourcesChain
 
 # ---- LangChain Core Packages ----
 from langchain_core.prompts import ChatPromptTemplate