Update app.py

app.py

@@ -986,7 +986,7 @@ with block:
                     # output_bg = gr.Image(type="numpy", label="Preprocessed Foreground", height=480)
                 with gr.Group():
                     prompt = gr.Textbox(label="Prompt")
-                    bg_source = gr.Radio(choices=[e.value for e in BGSource[2:]],
+                    bg_source = gr.Radio(choices=[e.value for e in list(BGSource)[2:]],
                                         value=BGSource.GREY.value,
                                         label="Lighting Preference (Initial Latent)", type='value')
                 example_quick_subjects = gr.Dataset(samples=quick_subjects, label='Subject Quick List', samples_per_page=1000, components=[prompt])