Fatal error: Uncaught Error: Interface "MediaWiki\Installer\Hook\LoadExtensionSchemaUpdatesHook" not found in C:\xampp\htdocs\extensions\DiscussionTools\includes\Hooks\InstallerHooks.php:15 Stack trace: #0 {main} thrown in C:\xampp\htdocs\extensions\DiscussionTools\includes\Hooks\InstallerHooks.php on line 15