Fatal error: Uncaught Error: Class "MediaWiki\Installer\Task\Task" not found in /usr/www/otte/public/sphunt1/extensions/Echo/includes/InstallSchemaTask.php:16 Stack trace: #0 {main} thrown in /usr/www/otte/public/sphunt1/extensions/Echo/includes/InstallSchemaTask.php on line 16