Updated code

app.py

@@ -221,7 +221,7 @@ if st.session_state["vector_db"] and st.session_state["llm"]:
                 placeholder.markdown(full_response)
                 if response:
                     st.text("-------------------------------------")
-                    docs= st.session_state["ensemble_retriver"].get_relevant_documents(prompt)   
+                    docs= st.session_state["retriever"].get_relevant_documents(prompt)   
                     source_doc_list= []  
                     for doc in docs:
                         source_doc_list.append(doc.dict())