Fatal error: Uncaught Error: Class 'Sabre\VObject\ITip\ITipException' not found in /var/www/typo3/vendor/sabre/vobject/lib/ITip/SameOrganizerForAllComponentsException.php:16 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/sabre/vobject/lib/ITip/SameOrganizerForAllComponentsException.php on line 16