Fatal error: Uncaught Error: Interface "MediaWiki\Skin\Hook\SidebarBeforeOutputHook" not found in /var/www/html/w/extensions/Wikibase/repo/includes/Hooks/SidebarBeforeOutputHookHandler.php:28 Stack trace: #0 {main} thrown in /var/www/html/w/extensions/Wikibase/repo/includes/Hooks/SidebarBeforeOutputHookHandler.php on line 28