fix app

app.py

@@ -258,7 +258,7 @@ with gr.Blocks(css=css) as demo:
 
         prompt_in = gr.Textbox(label="Prompt", placeholder="A chihuahua in astronaut suit floating in space, cinematic lighting, glow effect")
         # output_size = gr.Dropdown(["576x1024", "256x256"], label="Output Size", info="576x1024 is watermark-free"),
-        output_size = "256x256"
+        output_size = gr.Dropdown(["576x1024", "256x256"], label="Output Size", value="256x256", info="576x1024 is watermark-free"),
         submit_btn = gr.Button("Generate")
         video_result = gr.Video(label="Video Output")