Hello, folks! I have a question for a non-fiction ebook I'm doing.
Full discretion: I formatted the text in InDesign and exported to epub3, and cleaned it up in Calibre.
Also: I work all of the time like this and rarely run into problems (But when I do, it's with iBooks or IngramSpark! yay.)
Ok, so this ebook has nothing listed in the debug section of calibre and validates through the idpf website with no issues, too. But on upload to IngramSpark, I get this error:
[ERROR]OEBPS/content.opf: 2,213: URL expected instead of calibre:
[ERROR]OEBPS/content.opf: 20,46: Undecleared prefix: calibre
The issue is that the prefix: calibre IS 'decleared' (nice typo):
https://image.ibb.co/f2h8qT/Screen_S...3_10_50_PM.png
And isn't being used in line 20 anyway. Likewise, there's a URL attached in line 1 (but not line 2, because that doesn't even look applicable).
Can someone help me? Is this something I'm doing wrong or is IngramSpark's validator screwy?