Fatal error: Uncaught Error: Class "Symfony\Component\Config\Definition\Builder\NodeDefinition" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\config\Definition\Builder\VariableNodeDefinition.php:21 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\config\Definition\Builder\VariableNodeDefinition.php on line 21