Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Definition\Builder\ScalarNodeDefinition' not found in /var/www/typo3/vendor/symfony/config/Definition/Builder/NumericNodeDefinition.php:21
Stack trace:
#0 {main}
thrown in /var/www/typo3/vendor/symfony/config/Definition/Builder/NumericNodeDefinition.php on line 21