Error in Multitracker.py while running demo.py

[sharoseali]

HI @CaptainEven I want to detect track 10 classes, for that I used my yolov3 detection model with .weights but when i run demo.py. I am getting the error below, I debug and find that reid_feat_out is empty. Can you help please, why I am getting re_feature_out as null.......
thanks

Traceback (most recent call last):
  File "demo.py", line 623, in <module>
    demo.run()
  File "demo.py", line 611, in run
    track_videos_vid(self.opt)
  File "demo.py", line 415, in track_videos_vid
    online_targets_dict = tracker.update_tracking(img, img0)
  File "/home/sharoze/Downloads/MCMOT/YOLOV4_MCMOT/tracker/multitracker.py", line 594, in update_tracking
    reid_feat_out[0] = F.normalize(reid_feat_out[0], dim=1)
  File "/home/sharoze/.conda/envs/Sharoze/lib/python3.6/site-packages/torch/nn/functional.py", line 3045, in normalize
    denom = input.norm(p, dim, True).clamp_min(eps).expand_as(input)
AttributeError: 'list' object has no attribute 'norm'