Update app.py

app.py

@@ -78,7 +78,7 @@ def generate(
         max_cfg_scale=2, 
         contrast_enhance_scale=1.2
     )
-    model_manager.to(0)
+    model_manager.to("cpu")
     export_to_video(frames, video_path, fps=fps_id)
     
     return video_path, seed