Fatal error: Uncaught Error: Class "TYPO3\CMS\Extbase\Error\Error" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extbase/Classes/Validation/Error.php:21 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extbase/Classes/Validation/Error.php on line 21