Update app.py

app.py

@@ -5,6 +5,7 @@ from langchain_community.embeddings import HuggingFaceEmbeddings
 from langchain.chains import RetrievalQA
 from langchain_google_genai import GoogleGenerativeAI
 from langchain.prompts import PromptTemplate
+from langchain.chains import load_qa_chain, RetrievalQA
 import requests
 from bs4 import BeautifulSoup
 from urllib.parse import urljoin