Did you use some other program to create this EPUB (InDesign->EPUB, Word->EPUB, [...])?
Or did you try to zip this manually?
Or did you use Sigil/Calibre?
Something like this shouldn't occur normally...
* * *
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.
Maybe whatever tool you used to create the EPUB forgot to create this file. Looks like it may have been the name of your HTML Table of Contents (did you accidentally delete it?).
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.