'FileDataset' object has no attribute 'PerFrameFunctionalGroupsSequence'

[moonforsun]

Thanks for the very useful tool!
I got the following error while I wanted to convert a sequence of dicoms to nifti.

AttributeError: 'FileDataset' object has no attribute 'PerFrameFunctionalGroupsSequence'

How can I resolve this error?

If I load every single dicom slice, I can get (0020, 0032) Image Position (Patient) information via pydicom. Would this be used to stack dicoms together?

[moonforsun]

More context for where the errors come out:
In the common.py

def multiframe_validate_orientation(dicoms):
    """
    Validate that all dicoms have the same orientation

    :param dicoms: list of dicoms
    """

    frame_info = dicoms[0].PerFrameFunctionalGroupsSequence