Fatal error: Uncaught Error: Interface 'Symfony\Component\Serializer\Mapping\Loader\LoaderInterface' not found in D:\workspaces\liZiPingBack\vendor\symfony\serializer\Mapping\Loader\FileLoader.php:21 Stack trace: #0 {main} thrown in D:\workspaces\liZiPingBack\vendor\symfony\serializer\Mapping\Loader\FileLoader.php on line 21