Quote:
Originally Posted by SensualPoet
I ran into exactly this same error (with a book from Kobo). I opened the (DRM removed) ePub in Sigil, clicked "save" to over-write, and then tried to open in Calibre then convert to mobi. That appeared to have worked just fine.
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This just happened to me with a book I purchased from Kobo, calibre won't let me do anything with it due to this DTBook markup
I've never used Sigil before but as above I have installed it opened the ePub in Sigil and re-saved it but calibre still throws up the error. Is there something else I have to do in Sigil to get rid of the DTBook markup(not entirely sure what this is btw)