IngramSpark citing content.opf errors I can't find in the .opf

[persand]

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?

[kovidgoyal]

It's a bug in whatever validator it uses. It probably chokes on a prefix attribute that has multiple prefixes or prefixes it does not know about. You can work around it by deleting the calibre prefix and any properties that use it from the OPF.

[persand]

Thank you! That did it.

Thanks for all of your work on this program and all of the support you do here, by the way! I've used your program for years and appreciate everything you've done so far.

[kovidgoyal]

You're welcome

[DaniMac]

Originally Posted by kovidgoyal

It's a bug in whatever validator it uses. It probably chokes on a prefix attribute that has multiple prefixes or prefixes it does not know about. You can work around it by deleting the calibre prefix and any properties that use it from the OPF.

I have this same problem. I get the following error messages.
[ERROR]content.opf: 1,133: URL expected instead of calibre:
[ERROR]content.opf: 67,64: Undecleared prefix: calibre
[ERROR]content.opf: 72,50: Undecleared prefix: calibre
[ERROR]content.opf: 75,121: Undecleared prefix: calibre

Unfortunately, I don't know how to delete the calibre references, as you suggest. Could you please provide more detail? I like calibre and want to continue using it so I'm hoping you can help me.
Thanks.