Update app.py

app.py

@@ -51,7 +51,7 @@ def main():
 
             vectorstore.save_local(DB_FAISS_PATH)
 
-            chain= etrievalQA.from_chain_type(llm=llm, chain_type = "stuff",return_source_documents=True, retriever=vectorstore.as_retriever()) 
+            chain= retrievalQA.from_chain_type(llm=llm, chain_type = "stuff",return_source_documents=True, retriever=vectorstore.as_retriever()) 
             result=chain(query)
 
             st.write(result['result'])