Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Extension\Extension' not found in D:\workspaces\liZiPingBack\vendor\symfony\debug-bundle\DependencyInjection\DebugExtension.php:30 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\debug-bundle\DependencyInjection\DebugExtension.php on line 30