Fatal error: Uncaught Error: Class "OCP\Migration\SimpleMigrationStep" not found in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Migration/Version12000Date20210217134030.php:20 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/spreed/lib/Migration/Version12000Date20210217134030.php on line 20