Check each link in your toc.ncx to see where it points. If the destination of any link is styled with "display: none" then kindlegen may fail. Note that the "display: none" is probably contained in your css and it might possibly be applied to a tag that is a parent of the link destination.
ETA: It says the link is to "OPS/Title.html#" so make sure that file exists and check the styles applied to the top level html & body tags of that file.
ETA2: Since this is a question about kindle formats you might want to ask to have this thread moved to the forum specific to that. An expert there may be more helpful with this problem.
Last edited by jhowell; 11-18-2016 at 06:07 PM.
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