Fatal error: Uncaught Error: Interface "OCA\Mail\Service\Avatar\IAvatarSource" not found in /home/tzuovhm/tzuovhm/apps_/mail/lib/Service/Avatar/AddressbookSource.php:18 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/mail/lib/Service/Avatar/AddressbookSource.php on line 18