Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/core/Migrations/Version14000Date20180626223656.php:11 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/core/Migrations/Version14000Date20180626223656.php on line 11