Fatal error: Uncaught Error: Class "Symfony\Component\Config\Definition\VariableNode" not found in C:\xampp\htdocs\hannoole\PMS\vendor\symfony\config\Definition\ScalarNode.php:28 Stack trace: #0 {main} thrown in C:\xampp\htdocs\hannoole\PMS\vendor\symfony\config\Definition\ScalarNode.php on line 28