Update app.py

app.py

@@ -100,7 +100,7 @@ with gr.Blocks() as demo:
                   outputs=[webrtc], time_limit=90)
     webrtc.on_additional_outputs(lambda history, code: (history, code),
                                  outputs=[history, code])
-    code.change(display_in_sandbox, code, html, queue=False)
+    code.change(display_in_sandbox, code, sandbox, queue=False)
 
 if __name__ == "__main__":
     demo.launch()