Quote:
Originally Posted by cyrenemary
Duplicate entry in the ZIP file: '%1$f'. :f != java.lang.String
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That looks more like an error in epubcheck than it does an error in the ePub.
Are you sure your Java is up-to-date? Are you running epubcheck 4.02?
One thing you can do is try the Calibre editor's check and see what errors it comes up with.