Quote:
Originally Posted by CrossReach
It has something to do with the TOC I generated with Word 2016. I think I know what it means, maybe I don't, but I certainly have no idea how to fix it.
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Your NCX TOC is broken. Try the following:
1. Open the epub with Calibre E-book Editor or Sigil, re-generate the TOC and check your book with the
IDPF validator.
2. If the book still doesn't pass EpubCheck, open it with Calibre E-book Editor, click "Run check" and "Try to correct all fixable errors automatically."