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