Similar Problem
Hi - I'm new here and feel fortunate to have found you. My problem is similar: I'm publishing an ePub to Lightning Source and my book (384 pages; some of it not too bad). I used Sigil exclusively and the ePub output passed the Threepress ePub validity check - that is, until I insert a cover and small photo on the last page. The Threepress error message is "missing attribute". What attribute is it looking for? Thanks for any help you can provide.
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