User blog comment:RaijinSenshi19/The (Unofficial) Buddyfight Area Update!!/@comment-4664494-20151217092909/@comment-24965906-20151217150949

This is because the SIM is trying to get at data from the folder in your computer that you don't possess. Rather than draw on blank data, the SIM will abort.

You'll need to re-download the updates and make sure you extract everything that is in those updates into it's proper folder.