Fatal error: Uncaught Error: Class "OC\Core\Command\Base" not found in /home/tzuovhm/tzuovhm/nextcloud/apps/activity/lib/Command/SendEmails.php:20 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/nextcloud/apps/activity/lib/Command/SendEmails.php on line 20