As usual, for people who can't open it in certain readers, open the file in any extractor (winzip/winrar/7zip), navigate to OEBPS/content.opf and open it via notepad.
Then delete the lines below before saving:
<item id="jnovels.xhtml" href="Text/jnovels.xhtml" media-type="application/xhtml+xml"/>
<item id="x1.png" href="Images/1.png" media-type="image/png"/>
<itemref idref="jnovels.xhtml"/>
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sdarkpaladin