Fatal error: Uncaught Error: Interface "MediaWiki\Hook\SpecialTrackingCategories__preprocessHook" not found in /home/hiphopdi/public_html/wiki2/extensions/CategoryTree/includes/Hooks.php:54 Stack trace: #0 {main} thrown in /home/hiphopdi/public_html/wiki2/extensions/CategoryTree/includes/Hooks.php on line 54