Update app.py

app.py

@@ -446,7 +446,7 @@ with gr.Blocks() as demo:
                     video_in = gr.Video(label="Video IN")
             
             with gr.Column():
-                with gf.Row():
+                with gr.Row():
                     working_frame = gr.Dropdown(label="working frame ID", choices=[""], value=None, visible=False, allow_custom_value=False, interactive=True)
                     change_current = gr.Button("change current ")
                 output_result = gr.Image(label="current working mask ref")