Fatal error: Uncaught Error: Interface "MediaWiki\Hook\SpecialTrackingCategories__preprocessHook" not found in /home/floten1/q.tenbergen.ca/extensions/CategoryTree/includes/Hooks.php:57 Stack trace: #0 {main} thrown in /home/floten1/q.tenbergen.ca/extensions/CategoryTree/includes/Hooks.php on line 57