Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/apps_/user_ldap/lib/Migration/GroupMappingMigration.php:15 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/user_ldap/lib/Migration/GroupMappingMigration.php on line 15