Getting 'IndexError: list index out of range' when running structure prediction

[Gaurav-Singh-1998]

While trying to run the structure prediction step in Google Colab I get,

Traceback (most recent call last):
  File "/content/DeepAb/deepab/models/ModelEnsemble.py", line 21, in __init__
    self._num_out_bins = self.models[0]._num_out_bins
IndexError: list index out of range

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "predict.py", line 190, in <module>
    _cli()
  File "predict.py", line 156, in _cli
    device=device)
  File "/content/DeepAb/deepab/models/ModelEnsemble.py", line 23, in __init__
    self._num_out_bins = self.models[0].num_out_bins
IndexError: list index out of range

What is going wrong?