Starting training fails

[Tomoeee889]

Hi,
when I launch the dataloader code it fails with error:

hydra.errors.InstantiationException: Error in call to target 'proteinfoundation.datasets.transforms.CoordsToNanometers':
TypeError("Can't instantiate abstract class CoordsToNanometers with abstract method forward")
full_key: datamodule.transforms0

What does it mean? All classes in transforms.py which inherit BaseTransform use call (...) instead of forward(...).