Thread: Error "Undecleared prefix: calibre" when uploading to Smashwords
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Old 12-28-2016, 11:11 PM   #2
kovidgoyal
creator of calibre
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Probably smashwords is using a broken/outdated version of epubcheck. It is safe to remove all calibre: references from the OPF. They are used for calibre specific metadata, which you dont care about when publishing a book.
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