Fatal error: Uncaught Error: Class "Symfony\Component\Config\Definition\ScalarNode" not found in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/config/Definition/EnumNode.php:21 Stack trace: #0 {main} thrown in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/config/Definition/EnumNode.php on line 21