Keep getting "nothing changed" error

[bwinter88]

Hi, I'm trying to edit some tags in some DNG files but keep getting "1 files unchanged" no matter what I do.

I'm trying to run this command

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exiftool -v2 -DefaultCropSize='1920 1080' test.DNG

and all I get is

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Editing tags in: IFD0 SubIFD TIFF
  Creating tags in: IFD0 SubIFD TIFF
  FileType = DNG
  FileTypeExtension = DNG
  MIMEType = image/x-adobe-dng
  ExifByteOrder = II
  Rewriting IFD0
  Rewriting ExifIFD
  Copying 1 image data blocks
Nothing changed in test.DNG
    0 image files updated
    1 image files unchanged

I've tried this on two different Macs, different files, using sudo, still same error.

[Hayo Baan]

What does exiftool -DefaultCropSize test.DNG tell you?