Update app.py

app.py

@@ -21,6 +21,7 @@ def run_text(self, text, state):
 
 with gr.Blocks(css="#chatbot {overflow:auto; height:500px;}") as demo:
     chatbot = gr.Chatbot(elem_id="chatbot",show_label=False)
+    state = gr.State([])
     with gr.Row() as input_raws:
         with gr.Column(scale=0.6):
             txt = gr.Textbox(show_label=False).style(container=False)