Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Loader\FileLoader' not found in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Loader\IniFileLoader.php:22 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Loader\IniFileLoader.php on line 22