Fatal error: Uncaught Error: Class "TYPO3\CMS\Extensionmanager\Exception\ExtensionManagerException" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extensionmanager/Classes/Remote/VerificationFailedException.php:25 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-extensionmanager/Classes/Remote/VerificationFailedException.php on line 25