Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Argument\IteratorArgument' not found in /var/www/typo3/vendor/symfony/dependency-injection/Argument/TaggedIteratorArgument.php:19 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/symfony/dependency-injection/Argument/TaggedIteratorArgument.php on line 19