Fatal error: Uncaught Error: Class "Symfony\Component\Config\Definition\Builder\ScalarNodeDefinition" not found in /home/technoon/public_html/demo/yondy/vendor/symfony/config/Definition/Builder/EnumNodeDefinition.php:21 Stack trace: #0 {main} thrown in /home/technoon/public_html/demo/yondy/vendor/symfony/config/Definition/Builder/EnumNodeDefinition.php on line 21