Unable to generate Kindle mobi file

Scrivener gives me an error message when I try to compile a book to Kindle mobi8 format. There are no problems creating an epub 3 file.

This seems to be the relevant part of the error message: Warning(prcgen):W30013: Invalid “nav” element in Navigation file.

I tried leaving the Table of Contents out of the file but still get the same error message.

Does anybody have any idea what it is?

Screenshots of error message:



A fix is on its way…