Fatal error: Uncaught Error: Class 'Symfony\Component\Config\Loader\FileLoader' not found in D:\workspaces\liZiPingBack\vendor\symfony\routing\Loader\YamlFileLoader.php:29 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\routing\Loader\YamlFileLoader.php on line 29