Which means there are no errors. The downloaded book has a single ToC entry. This is named "Start" and points to a file called "titlepage.xhtml".
What this means is that the creator of this version of the book did not build a full ToC. This isn't that uncommon. And it might be deliberate. But, it is more likely a mistake, or inexperience on the part of the book creator. The only things you can do is to generate the ToC yourself, or find an edition that has the ToC. And maybe report it to the publisher, supplier or author to get it fixed.
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