A search on that phrase shows that this is an old issue that happens to any Gtk program when both 2 and 3 libraries are linked to the same executable. You could try
ldd kicad
(you need the path to the kicad binary) to see what dynamic libraries are required by the executable and then install the devel package for the ones that are still 2 and rebuild. If you succeed then report the bug as incomplete dependency list.