Fatal error: Uncaught Error: Class "TYPO3\CMS\Core\Log\Writer\AbstractWriter" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Log/Writer/NullWriter.php:23 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/Log/Writer/NullWriter.php on line 23