Update app.py

app.py

@@ -966,7 +966,7 @@ with gr.Blocks() as block:
     bf_event = bf_button.click(fn=bf_trigger.run_preprocess_ai, inputs=[bf_topical_map, bf_selection, section], outputs=[bf_upload])
     offline_event = offline_button.click(fn=offline_update.run_preprocess_ai, inputs=[offline_topical_map, offline_selection], outputs=[offline_upload])
     stop.click(fn=None, inputs=None, outputs=None, cancels=[algo_event])
-    stop_bf.click(fn=None, inputs=None, outputs=None, cancels[bf_event])
+    stop_bf.click(fn=None, inputs=None, outputs=None, cancels=[bf_event])
     upload_btn.upload(upload_file, upload_btn, zipfile)
     # stop_offline.click(fn=None, inputs=None, outputs=None, cancels=[offline_event])
     # login_to_zipfile_btn.click(