Fatal error: Uncaught Error: Class "Symfony\Component\Console\Command\Command" not found in /home/tzuovhm/tzuovhm/nextcloud/core/Command/Db/ConvertMysqlToMB4.php:19 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/nextcloud/core/Command/Db/ConvertMysqlToMB4.php on line 19