Fatal error: Uncaught Error: Interface "Psr\Container\ContainerInterface" not found in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/DependencyInjection/FailsafeContainer.php:25 Stack trace: #0 {main} thrown in /var/www/html/dev.hallescherfc.de/vendor/typo3/cms-core/Classes/DependencyInjection/FailsafeContainer.php on line 25