Fatal error: Uncaught Error: Class "TYPO3\CMS\Scheduler\Task\AbstractTask" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-linkvalidator/Classes/Task/ValidatorTask.php:42 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-linkvalidator/Classes/Task/ValidatorTask.php on line 42