Fatal error: Uncaught Error: Class "Sabre\VObject\Document" not found in /server/www/10.1.1.5/htdocs/vendor/sabre/vobject/lib/Component/VCalendar.php:23 Stack trace: #0 {main} thrown in /server/www/10.1.1.5/htdocs/vendor/sabre/vobject/lib/Component/VCalendar.php on line 23