Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /var/www/html/nextcloud/apps/deck/lib/Migration/Version1000Date20200306161713.php:15 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/deck/lib/Migration/Version1000Date20200306161713.php on line 15