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I just got this error for the first time on a Barnes and Noble book I was trying to convert with Calibre. I removed the DRM with Calibre, followed the suggestion to format with Sigil, which worked. I got the same "DTBook markup" markup error when trying to convert to ePub. Turns out I don't have to convert it again. The file opens just fine in other other ePub readers, just not Cailbre's. That doesn't help if you are trying to convert it to mobi, but maybe there's a clue there for someone more tech savvy than I am.
In any case, I removed the DRM and got an ebook file I can read in Moon+ Reader, which was my goal.
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