From
Smashwords:
Quote:
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If Meatgrinder detects a linked TOC, it'll use that to guide creation of your NCX. If it doesn't find a linked TOC, it'll auto-detect your Chapter XX headings. If it's unable to auto-detect a Chapter heading, it'll auto-insert a two-part NCX where the first item is the book's title and the second item is "Midpoint" that will point to an approximate midpoint in the book. An NCX is necessary for the books to flow properly to Kobo, thus our three-step process.
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There seems to be a long-standing problem with how this is implemented. If your document is small or has only a single chapter the two added TOC entries may point to the same place causing the validation error. Someone reported the same problem in 2011
in another thread.