Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Definition\Builder\NodeDefinition' not found in C:\xampp\htdocs\plugins\Symfony\Component\Config\Definition\Builder\VariableNodeDefinition.php:22 Stack trace: #0 {main} thrown in C:\xampp\htdocs\plugins\Symfony\Component\Config\Definition\Builder\VariableNodeDefinition.php on line 22