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Worth mentioning my solution (bug find) to the casual google searcher:
Setting the Read Only flag on a file will cause this issue. This means that if you for instance mark a file as "protected" in-camera, you will get this error when trying to cull it from the SD card or after importing it. Took me 2 years until I understood exactly what caused it from the first time I saw this. Reported to FRW support today.