Update app.py

app.py

@@ -61,7 +61,7 @@ retriever = db.as_retriever(search_type="similarity", search_kwargs={"k":10})
 qa = RetrievalQA.from_chain_type(
     llm=llm, chain_type="stuff", retriever=retriever, return_source_documents=False)
 
-bool called = False
+called = False
 
 if prompt := st.chat_input():
     st.chat_message("user").write(prompt)