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Resave any images in the book - i suspect one of them is failing as it may be corrupt. Try each page or sets of pages to see if you can find the problem page.
some links for more details https://helpx.adobe.com/indesign/kb/upload-error-publishing-indesign-document.html
Also refer to this https://helpx.adobe.com/indesign/kb/troubleshoot-publish-online-errors.html