The line of code 1 which raises the error tries to call the __init__ method from its parent class (torchmeta.utils.data.Dataset), which is defined here as torchmeta.utils.data.task.Dataset.
Looking at the __init__ method of this class in this line of code 1, it seems that the index argument is required and thus the error is raised.
I’m not familiar with the code base, but it looks like a bug in the dataset implementation, so I would recommend to create an issue in their repository.