Error while running c3d model on ucf101 official splits

I have just remove validation data and running c3d model on ucf101 official splits but the code is producing following error. please guide.

pytorch-video-recognition/dataloaders/dataset.py", line 294, in crop
    time_index = np.random.randint(buffer.shape[0] - clip_len)
  File "mtrand.pyx", line 747, in numpy.random.mtrand.RandomState.randint
  File "_bounded_integers.pyx", line 1254, in numpy.random._bounded_integers._rand_int64
ValueError: low >= high