Fatal error: Uncaught Error: Interface 'Sabre\VObject\TimezoneGuesser\TimezoneGuesser' not found in /var/www/typo3/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromMsTzId.php:10 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/sabre/vobject/lib/TimezoneGuesser/GuessFromMsTzId.php on line 10