I'm getting this error pop-up when I login to any character in my account after installing the Cartographer1 Ace2 Override
\Cartographer1\Libs\AceModuleCore-2.0\AceModuleCore-2.0.lua:196: AceOO-2.0: LibRockHook-1.0 is not an appropriate mixin
If I click the big red "Okay" button this goes away and never comes back until I switch characters.
It doesn't seem to break any of my Cartographer funtions that I can see and is mainly a nuisance.
What does this error mean and how can I "fix" it please?