Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/core/Migrations/Version13000Date20170705121758.php:13 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/core/Migrations/Version13000Date20170705121758.php on line 13