Error in __getitem__ method

[bl75]

Hi, whenever I try to execute the run.py as given, there is an error shown each time in the getitem method in every class error is

class BatchBeam(NamedTuple):
RuntimeError: __class__ not set defining 'BatchBeam' as <class 'utils.beam_search.BatchBeam'>. Was __classcell__ propagated to type.__new__?

Python version: 3.11.6
pytorch version: 2.0.0
SciPy : 1.14.0
NumPy: 1.23.5
tensorboard: 2.12.3
cuda 11.7