Update app.py

app.py

@@ -21,5 +21,5 @@ def echo(message, history):
 def yes_no(message, history):
     responses = ["Yes", "No"]
     return random.choice(responses)
-chatbot = gr.ChatInterface(respond, type=“messages”)
+chatbot = gr.ChatInterface(respond, type="messages")
 chatbot.launch()