Fail to load .ply file?(sorry!)

[AI-Hunter]

My pytorch version 1.10
Why it is fail to load .ply . it gives the following error:

................
  File "/anaconda3/envs/hais/lib/python3.7/site-packages/torch/serialization.py", line 608, in load
    return _legacy_load(opened_file, map_location, pickle_module, **pickle_load_args)
  File "/anaconda3/envs/hais/lib/python3.7/site-packages/torch/serialization.py", line 777, in _legacy_load
    magic_number = pickle_module.load(f, **pickle_load_args)
_pickle.UnpicklingError: unpickling stack underflow

Is there any solution?