I am very rusty about the technical differences between epub2 and 3. So I am not really clear about what to do about this new epubcheck error that came after converting the epub2 to epub3.
Col: 92: ERROR(OPF-096): Non-linear content must be reachable, but found no hyperlink to "OEBPS/nav.xhtml".
I tried to correct that, but ended up making more errors :-((
????
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