Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Definition\Exception\InvalidConfigurationException' not found in /var/www/typo3/vendor/symfony/config/Definition/Exception/DuplicateKeyException.php:20 Stack trace: #0 {main} thrown in /var/www/typo3/vendor/symfony/config/Definition/Exception/DuplicateKeyException.php on line 20