Update app.py

app.py

@@ -7,7 +7,7 @@ import re  # To help clean up leading whitespace
 from langchain_community.vectorstores import Chroma
 from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain_groq import ChatGroq
-from langchain.chains.retrieval_qa import RetrievalQA
+from langchain.chains.qa_with_sources.retrieval import RetrievalQAWithSourcesChain
 
 # Load the .env file (if using it)
 groq_api_key = os.getenv("GROQ_API_KEY")