Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /var/www/html/nextcloud/apps/text/lib/Migration/Version010000Date20190617184535.php:21 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/text/lib/Migration/Version010000Date20190617184535.php on line 21