Quote:
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.
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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.