Update

app.py

@@ -2,8 +2,11 @@
 
 import gradio as gr
 
-with gr.Blocks() as demo:
-    pass
 
-if __name__ == "__main__":
-    demo.queue().launch()
+def fn(message, history, text):
+    return message
+
+
+with gr.Blocks() as demo:
+    gr.ChatInterface(fn=fn, additional_inputs=[gr.Textbox()])
+demo.queue().launch()