Update app.py

app.py

@@ -105,7 +105,8 @@ with gr.Blocks() as demo:
     chatbot = gr.Chatbot(label="Chat history!!!")
     msg=gr.Textbox(label="Ask anything related to pdf...")
     clear = gr.Button("Clear chat")
-    
+
+    state = gr.State([]) 
 
     file_input.change(upload_pdf, inputs=[file_input], outputs=[status])
     msg.submit(ask_question, [msg, state], [chatbot, state])