Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Loader\Loader' not found in D:\workspaces\liZiPingBack\vendor\symfony\config\Loader\DelegatingLoader.php:24 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\config\Loader\DelegatingLoader.php on line 24