Fatal error: Uncaught Error: Interface "MediaWiki\Extension\UserMerge\Hooks\AccountFieldsHook" not found in /usr/www/otte/public/sphunt1/extensions/CheckUser/src/HookHandler/UserMergeHandler.php:7 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/CheckUser/src/HookHandler/UserMergeHandler.php on line 7