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#186861
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I’m attempting to validate an ePub.

What version of the ePub spec are you trying to validate against? AFAICT, 3.01 is the most recent spec.

using ePub validator

I don’t know of an ePub validator that the w3c provides. Do you mean you wrote your content in HTML and validated that? or are you talking about this validator?

<spine toc=”ncx”>

The toc attribute names an item with the given idref (in this case, it’s looking for an idref=ncx, and is complaining because it can’t find one.

see here for more.

It would seem that the NCX feature is part of ePub 2, and is not required in ePub 3 (it exists only for backwards-compatibility), so if you’re validating against version 3, you should be able to simply leave the toc attribute out.

Don’t quote me on this, however; I don’t know a lot about ePubs.