Uh, where are you getting that error? You can just select the UV set in the UV editor and do "Delete Current UV Set" (you can't delete the first set though I think).
I sorted it out sorry I could not see the empty UV sets in the UV set editor. But you must have to have geometry selected or something because I can see them now and deleted them thanks. Sorry I thought it was more complicated than that. No more questions from me for a while
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