Fatal error: Uncaught Error: Interface "MediaWiki\Hook\SpecialTrackingCategories__preprocessHook" not found in /var/www/html/orian-wiki/extensions/CategoryTree/includes/Hooks.php:53
Stack trace:
#0 {main}
thrown in /var/www/html/orian-wiki/extensions/CategoryTree/includes/Hooks.php on line 53