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It is saying you have an extra file or perhaps more than one in your ePUB document that should not be there. Change the extension of you ebook to .zip and then open it and take a look at the structure and see it there is an unusually named file. Sometimes Calibre can stick a bookmark file in the archive which will cause this error. Once you fix it then you can change the extension back to .epub. Note if you have 7zip then you can just open the archive without having to rename the extension.
Dale
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