I have seen this error occur when there are multiple levels of TOC nesting and the order of links in the TOC does not match the order of the targets within the book's structure. Specifically in cases where there links to different id's in the same html file that are not all sequential within the TOC or the TOC has entries with links to other html files between them.
Last edited by jhowell; 08-30-2016 at 09:23 AM.
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