Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Definition' not found in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\ChildDefinition.php:23 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\ChildDefinition.php on line 23