Fatal error: Uncaught Error: Interface "MediaWiki\Extension\UserMerge\Hooks\AccountFieldsHook" not found in C:\xampp\htdocs\extensions\CheckUser\src\HookHandler\UserMergeHandler.php:7 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\CheckUser\src\HookHandler\UserMergeHandler.php on line 7