Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Dumper\Dumper' not found in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Dumper\YamlDumper.php:37 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Dumper\YamlDumper.php on line 37