File is not a zip file

[wlcosta]

Hey!
I have a private dataset in which I am using MeshCNN for classification. However, at epoch 4, a random error occurred:

zipfile.BadZipFile: Caught BadZipFile in DataLoader worker process 1.
Original Traceback (most recent call last):
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/site-packages/torch/utils/data/_utils/worker.py", line 178, in _worker_loop
    data = fetcher.fetch(index)
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/site-packages/torch/utils/data/_utils/fetch.py", line 44, in fetch
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/site-packages/torch/utils/data/_utils/fetch.py", line 44, in <listcomp>
    data = [self.dataset[idx] for idx in possibly_batched_index]
  File "/media/wlc2/MeshCNN/data/classification_data.py", line 27, in __getitem__
    mesh = Mesh(file=path, opt=self.opt, hold_history=False, export_folder=self.opt.export_folder)
  File "/media/wlc2/MeshCNN/models/layers/mesh.py", line 16, in __init__
    fill_mesh(self, file, opt)
  File "/media/wlc2/MeshCNN/models/layers/mesh_prepare.py", line 9, in fill_mesh
    mesh_data = np.load(load_path, encoding='latin1', allow_pickle=True)
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/site-packages/numpy/lib/npyio.py", line 426, in load
    pickle_kwargs=pickle_kwargs)
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/site-packages/numpy/lib/npyio.py", line 182, in __init__
    _zip = zipfile_factory(fid)
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/site-packages/numpy/lib/npyio.py", line 112, in zipfile_factory
    return zipfile.ZipFile(file, *args, **kwargs)
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/zipfile.py", line 1131, in __init__
    self._RealGetContents()
  File "/home/wlc2/anaconda3/envs/meshcnn/lib/python3.6/zipfile.py", line 1198, in _RealGetContents
    raise BadZipFile("File is not a zip file")
zipfile.BadZipFile: File is not a zip file

And no, I don't have any zipfiles on my dataset. Any ideas?