Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/core/Migrations/Version14000Date20180522074438.php:16 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/core/Migrations/Version14000Date20180522074438.php on line 16