Fatal error: Uncaught Error: Interface 'Sabre\VObject\Splitter\SplitterInterface' not found in /var/www/typo3/vendor/sabre/vobject/lib/Splitter/ICalendar.php:22 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/sabre/vobject/lib/Splitter/ICalendar.php on line 22