I installed SimpleTooltip, but after I add the require_once line to LocalSettings.php and try to start my wiki (MW version 1.22.5, locally installed), I get the following error message:
[a0773652] /mediawiki/ Exception from line 181 of /Applications/MAMP/htdocs/mediawiki/includes/Hooks.php: Invalid callback in hooks for LocalisationCacheRecache
Backtrace:
#0 /Applications/MAMP/htdocs/mediawiki/includes/GlobalFunctions.php(3877): Hooks::run(string, array)
#1 /Applications/MAMP/htdocs/mediawiki/includes/cache/LocalisationCache.php(857): wfRunHooks(string, array)
#2 /Applications/MAMP/htdocs/mediawiki/includes/cache/LocalisationCache.php(442): LocalisationCache->recache(string)
[...]
Any ideas on how to fix this?