Quote:
Originally Posted by gianni_fed
as you can see from the attached file, I continue to have the "Not a ZIP file" error when I try to extract some books from my Calibre library with "Save on the disk" and "Save on the disk in a single folder".
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That's the line number in the Calibre source code where it's hitting the error Hence, if the error type is the same on all your books, then the reported lines are going to be the same. Useful for debugging purposes to identify where the problem is.
In your case, most likely it's just the EPUB files themselves that are corrupted. Testing the EPUB files with WinRAR, WinZIP or 7zip, etc would confirm if your EPUB files are corrupted.