Fatal error: Uncaught Psr\Log\InvalidArgumentException: The given severity level "alert" for writerConfiguration of logger "TYPO3.CMS.Core.Error.ErrorHandler" is not valid. in /www/htdocs/w01a8fe0/atech-antriebstechnik.de/t3atech/public/typo3/sysext/core/Classes/Log/LogManager.php:209 Stack trace: #0 /www/htdocs/w01a8fe0/atech-antriebstechnik.de/t3atech/public/typo3/sysext/core/Classes/Log/LogManager.php(136): TYPO3\CMS\Core\Log\LogManager->getConfigurationForLogger('writer', 'TYPO3.CMS.Core....') #1 /www/htdocs/w01a8fe0/atech-antriebstechnik.de/t3atech/public/typo3/sysext/core/Classes/Log/LogManager.php(103): TYPO3\CMS\Core\Log\LogManager->setWritersForLogger(Object(TYPO3\CMS\Core\Log\Logger)) #2 /www/htdocs/w01a8fe0/atech-antriebstechnik.de/t3atech/public/typo3/sysext/core/Classes/Utility/GeneralUtility.php(3687): TYPO3\CMS\Core\Log\LogManager->getLogger('TYPO3.CMS.Core....') #3 /www/htdocs/w01a8fe0/atech-antriebstechnik.de/t3atech/public/typo3/sysext/core/Classes/Core/Bootstrap.php(705): TYPO3\CMS\Core\Utility\GeneralU in /www/htdocs/w01a8fe0/atech-antriebstechnik.de/t3atech/public/typo3/sysext/core/Classes/Log/LogManager.php on line 209