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