Not had this error before:
Code:
calibre, version 5.4.2
ERROR: KFX conversion failed: <p><b>Cannot convert "Book name"
Conversion error: E24010: Hyperlink not resolved in toc (One possible reason
can be that the link points to a tag with style
display:none):/private/var/folders/8f/px1dqgxj2wlg9l51xhcpv22m0000gn/T/396782c4-6ed7-
4a12-a58d-527487f92122/cTemp/mTemp/mobi-n5lQ2o/OEBPS/Cover.xhtml#