Fatal error: Uncaught Error: Class 'Symfony\Component\DependencyInjection\Argument\IteratorArgument' not found in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Argument\TaggedIteratorArgument.php:19 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\dependency-injection\Argument\TaggedIteratorArgument.php on line 19