Fatal error: Uncaught Error: Class "OCP\AppFramework\Db\Entity" not found in /home/tzuovhm/tzuovhm/apps_/mail/lib/Db/Classifier.php:51 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/mail/lib/Db/Classifier.php on line 51