Fatal error: Uncaught Error: Interface "MediaWiki\Installer\Hook\LoadExtensionSchemaUpdatesHook" not found in /usr/www/otte/public/sphunt1/extensions/Echo/includes/SchemaHooks.php:8 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/Echo/includes/SchemaHooks.php on line 8