Thank you so much for your message.
Quote:
Looks like these are the two issues:
1. The book is expecting you to have a file guide.xhtml, but it isn't in the EPUB.
2. It looks like your cover file is cover.png, so you should be able to delete this extra line:
Code:
<item id="cover_png" href="Images/cover.png" media-type="image/png" properties="cover-image"/>
Explanation: There's only supposed to be a single cover for the EPUB... but whatever tool you used accidentally points to the cover twice.
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So, the
original file came from a website that auto-generates the file from content on the site. I don't know what they were using on the backend to create it but I will ask.
The file I posted was from
a later version that I worked on in Sigil. At one point in the process I used the epub2 to epub3 export plugin.
I went back to the original file and found this...
Code:
<item id="cover_png" properties="cover-image" href="images/cover.png" media-type="image/png"/>
<item href="images/cover.png" id="img001" media-type="image/png"/>
Different from what I posted in the OP, but clearly still not right.
The validator in Sigil had never had any issue before or after converting it to epub3. In fact the only reason I am hopping down this rabbit hole is that the cover isn't showing up when the book is uploaded to google books/play. But for now I'm just trying to get it to validate so I can rule that out.
Thanks again! I still need to investigate point 1 in your very helpful message.