Fatal error: Uncaught Error: Interface "MediaWiki\Hook\SidebarBeforeOutputHook" not found in /usr/www/otte/public/sphunt1/extensions/CheckUser/src/HookHandler/SidebarLinksHandler.php:16 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/CheckUser/src/HookHandler/SidebarLinksHandler.php on line 16