Update app.py

app.py

@@ -2,6 +2,8 @@ import gradio as gr
 def echo(message, history):
     return message
 
-chatbot = gr.ChatInterface(echo) #chatbot UI - conversation history and user input
+print("Hello, world!")
+
+chatbot = gr.ChatInterface(echo, type="messages") #chatbot UI - conversation history and user input
 
 chatbot.launch()