Fatal error: Uncaught Error: Class "Sabre\VObject\Document" not found in /home/tzuovhm/tzuovhm/3rdparty_/sabre/vobject/lib/Component/VCalendar.php:23 Stack trace: #0 {main} thrown in /home/tzuovhm/tzuovhm/3rdparty_/sabre/vobject/lib/Component/VCalendar.php on line 23