Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Loader\FileLoader' not found in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Loader\YamlFileLoader.php:40 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Loader\YamlFileLoader.php on line 40