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I assume you did some manual changes in either the content.opf and/or toc.ncx. Perhaps some copy/pasting of another ePUB.
Anyway, an ePUB must have an unique indentifier and this is specified in the content.opf. You could try to regenerate the TOC (not the HTML TOC) to fix this. This should solve it, as the toc.ncx should not contain an UUID.
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