Thread: IngramSpark citing content.opf errors I can't find in the .opf
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Old 06-26-2018, 09:06 PM   #2
kovidgoyal
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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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