Fatal error: Uncaught Error: Class 'Symfony\Component\HttpKernel\DependencyInjection\Extension' not found in D:\workspaces\liZiPingBack\vendor\nelmio\api-doc-bundle\DependencyInjection\NelmioApiDocExtension.php:34 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\nelmio\api-doc-bundle\DependencyInjection\NelmioApiDocExtension.php on line 34