Update app.py

app.py

@@ -26,7 +26,7 @@ with gr.Blocks() as demo:
             label="Upload Image",
             file_types=[".jpg",".jpeg"],
             file_count="multiple")
-        btn.upload(fn=detect, inputs=btn, outputs=gr.Label(), api_name="predict")
+        btn.upload(fn=detect, inputs=btn, outputs=[gr.Label()], api_name="predict")
 # put gr.Label() in upload(outputs=gr.Label())
 
 demo.launch()