Update app.py

app.py

@@ -145,7 +145,7 @@ def conversation(qa_chain, message, history):
     return qa_chain, new_history, response_source1, response_source1_page, response_source2, response_source2_page, response_source3, response_source3_page
 
 def demo():
-    with gr.Block() as demo:
+    with gr.Blocks() as demo:
         vector_db = gr.State()
         qa_chain = gr.State()
         collection_name = gr.State()