Fatal error: Uncaught Error: Interface "MediaWiki\Installer\Hook\LoadExtensionSchemaUpdatesHook" not found in C:\xampp\htdocs\extensions\Math\src\HookHandlers\SchemaHooksHandler.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\Math\src\HookHandlers\SchemaHooksHandler.php on line 11