Fatal error: Uncaught Error: Interface 'MediaWiki\Hook\MediaWikiServicesHook' not found in /home/mapeador/solecov2/w/extensions/CategoryTree/includes/ConfigHookHandler.php:37 Stack trace: #0 {main} thrown in /home/mapeador/solecov2/w/extensions/CategoryTree/includes/ConfigHookHandler.php on line 37