Fatal error: Uncaught Error: Class "OCP\AppFramework\Http\DownloadResponse" not found in /home/tzuovhm/tzuovhm/apps_/mail/lib/Http/AttachmentDownloadResponse.php:19 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/apps_/mail/lib/Http/AttachmentDownloadResponse.php on line 19