Epub - 5190

: Issues within the content.opf file that prevent the e-reader from understanding the book's structure.

: The EPUB (Electronic Publication) format itself is the global standard for reflowable digital books, supported by almost all major e-readers and apps like Apple Books and Google Play Books . 5190 epub

If you are seeing "5190" in a specific app, could you clarify is displaying it? This will help pinpoint if it's a specific library ID or a localized system error. : Issues within the content