Update app.py

app.py

@@ -38,6 +38,7 @@ from longcat_video.modules.scheduling_flow_match_euler_discrete import FlowMatch
 from longcat_video.modules.autoencoder_kl_wan import AutoencoderKLWan
 from longcat_video.modules.longcat_video_dit import LongCatVideoTransformer3DModel
 from longcat_video.context_parallel import context_parallel_util
+from transformers import AutoTokenizer, UMT5EncoderModel
 from diffusers.utils import export_to_video
 
 # Download model weights from Hugging Face Hub if they don't exist