Fatal error: Uncaught Error: Class 'Sabre\VObject\Property' not found in /var/www/typo3/vendor/sabre/vobject/lib/Property/ICalendar/DateTime.php:27 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/sabre/vobject/lib/Property/ICalendar/DateTime.php on line 27