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