Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in D:\workspaces\liZiPingBack\vendor\symfony\framework-bundle\DependencyInjection\FrameworkExtension.php:142 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\framework-bundle\DependencyInjection\FrameworkExtension.php on line 142