Update app.py

app.py

@@ -139,7 +139,7 @@ def get_layout():
                 '<div class="footer">© 2024 LCL 版權所有<br>開發者：何立智、楊哲睿</div>',
             )
             gr.on(
-                start.click,
+                start_button.click,
                 fn=predict,
                 inputs=image_input,
                 outputs=chart,