Epub validation correction

I tested my epub mss on three different readers with no problem, but submitting the file to Ingram has returned multiple (!!) “fragment identifier is not defined” errors. How to handle correction with a Pressbooks epub file?

Hi @nanbush it really depends on what the errors are and where they’re originating. In my experience, the best place to start is often this EPUB validator tool: http://validator.idpf.org/. Ingram may also have some guidance or help available, if they’re the one rejecting your file upload. You may find other helpful advice in our guide chapters: https://guide.pressbooks.com/chapter/testing-your-ebooks/ and https://guide.pressbooks.com/chapter/export-validation-logs/. Fixing validator errors can be frustrating – good luck!

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