Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /var/www/html/nextcloud/apps/user_ldap/lib/Migration/Version1120Date20210917155206.php:23 Stack trace: #0 {main} thrown in /var/www/html/nextcloud/apps/user_ldap/lib/Migration/Version1120Date20210917155206.php on line 23