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[juneane]

when I detetcted on the video by --video-input video.mp4,I got a error:
Traceback (most recent call last):
File "demo.py", line 163, in
for vis_frame in tqdm.tqdm(demo.run_on_video(video, args.confidence_threshold), total=num_frames):
File "/home/juneana/anaconda3/envs/SWINTS/lib/python3.8/site-packages/tqdm/std.py", line 1195, in iter
for obj in iterable:
File "/media/juneana/newvolume/model/SwinTextSpotter-main/demo/predictor.py", line 133, in run_on_video
yield process_predictions(frame, self.predictor(frame))
File "/media/juneana/newvolume/model/SwinTextSpotter-main/demo/predictor.py", line 102, in process_predictions
vis_frame = video_visualizer.draw_instance_predictions(frame, predictions)
File "/media/juneana/newvolume/model/SwinTextSpotter-main/detectron2/utils/video_visualizer.py", line 84, in draw_instance_predictions
detected = [
File "/media/juneana/newvolume/model/SwinTextSpotter-main/detectron2/utils/video_visualizer.py", line 85, in
_DetectedInstance(classes[i], boxes[i], mask_rle=None, color=None, ttl=8)
TypeError: 'NoneType' object is not subscriptable