pickle.UnpicklingError: invalid load key, 'n'.

[STL1-coder]

Traceback (most recent call last):
File "/content/DBNet.pytorch/tools/eval.py", line 78, in
eval = EVAL(args.model_path)
File "/content/DBNet.pytorch/tools/eval.py", line 31, in init
checkpoint = torch.load(model_path, map_location=torch.device('cpu'))
File "/usr/local/lib/python3.10/site-packages/torch/serialization.py", line 815, in load
return _legacy_load(opened_file, map_location, pickle_module, **pickle_load_args)
File "/usr/local/lib/python3.10/site-packages/torch/serialization.py", line 1033, in _legacy_load
magic_number = pickle_module.load(f, **pickle_load_args)
_pickle.UnpicklingError: invalid load key, 'n'.

How to resolve this issue occur during running bash eval.sh