Fatal error: Uncaught Error: Class "Symfony\Component\Config\Definition\VariableNode" not found in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/config/Definition/ScalarNode.php:28 Stack trace: #0 {main} thrown in /home/.sites/site4/wwwroot/web/4.0/ui/vendor/symfony/config/Definition/ScalarNode.php on line 28