Fatal error: Uncaught Error: Interface "MediaWiki\Installer\Hook\LoadExtensionSchemaUpdatesHook" not found in C:\xampp\htdocs\extensions\CheckUser\src\HookHandler\SchemaChangesHandler.php:18 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\CheckUser\src\HookHandler\SchemaChangesHandler.php on line 18