Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Definition\VariableNode' not found in D:\workspaces\liZiPingBack\vendor\symfony\config\Definition\ScalarNode.php:28 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\config\Definition\ScalarNode.php on line 28