Update app.py

app.py

@@ -253,7 +253,7 @@ if __name__ == "__main__":
         run_btn = gr.Button("generate", variant="primary")
         interrupt_btn = gr.Button("interrupt")
 
-        output_midi_seq = gr.State()
+        output_midi_seq = gr.JSON()
         output_midi_visualizer = gr.HTML(elem_id="midi_visualizer_container")
         output_audio = gr.Audio(label="output audio", format="mp3", elem_id="midi_audio")
         output_midi = gr.File(label="output midi", file_types=[".mid"])