Raise "DatasetGenerationError" instead of "UnexpectedError"
And give the details to the users. It generally helps them fix the underlying error by giving the underlying error message.

See https://huggingface.co/datasets/ibrahimhamamci/CT-RATE/discussions/56#661d1ce1689f5231501a0f9b for example.

related to #1443
Raise "DatasetGenerationError" instead of "UnexpectedError": And give the details to the users. It generally helps them fix the underlying error by giving the underlying error message.

See https://huggingface.co/datasets/ibrahimhamamci/CT-RATE/discussions/56#661d1ce1689f5231501a0f9b for example.

related to #1443