Fatal error: Uncaught Error: Interface "OCP\Collaboration\Collaborators\ISearchPlugin" not found in /home/tzuovhm/tzuovhm/lib_/private/Collaboration/Collaborators/MailPlugin.php:22 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/lib_/private/Collaboration/Collaborators/MailPlugin.php on line 22