Fatal error: Uncaught Error: Interface 'Symfony\Component\DependencyInjection\Dumper\DumperInterface' not found in /var/www/typo3/vendor/symfony/dependency-injection/Dumper/Dumper.php:21 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/symfony/dependency-injection/Dumper/Dumper.php on line 21