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I downloaded one of your books and it appears to be a copyright book which should not be made publicly available.
Otherwise, the book has multiple errors including // in the stylesheet which appears to have been an effort to comment out text-align: justify lines and multiple other errors such as an alt="image" in the svg cover image wrapper, the cover being supplied by a cover.xml (it must be htm, html or xhtml).
Calibre's check popped up enought errors to choke the proverbial horse and epubcheck came up with even more.
I would suggest installing the epubcheck plugin for the calibre editor and correcting those errors before trying to edit the TOC.
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