EOFError: Ran out of input HELP!!

[TigerandRosa]

Traceback (most recent call last):
File "train.py", line 628, in
model = Yolov4(cfg.pretrained, n_classes=cfg.classes)
File "/home/wd337/wly/pytorch-YOLOv4-Tianxiaomo/models.py", line 426, in init
pretrained_dict = torch.load(yolov4conv137weight)
File "/home/wd337/anaconda3/envs/yolov4-wang/lib/python3.7/site-packages/torch/serialization.py", line 595, in load
return _legacy_load(opened_file, map_location, pickle_module, **pickle_load_args)
File "/home/wd337/anaconda3/envs/yolov4-wang/lib/python3.7/site-packages/torch/serialization.py", line 774, in _legacy_load
result = unpickler.load()
EOFError: Ran out of input

771 _sys_info = pickle_module.load(f, **pickle_load_args)
772 unpickler = pickle_module.Unpickler(f, **pickle_load_args)
773 unpickler.persistent_load = persistent_load
774 result = unpickler.load()

i encountered this problem suddenly that i never meet before. i don't know what is wrong? anyone encountered this problem? i look forward to your answer.