Fatal error: Uncaught Error: Class "Symfony\Component\Translation\Dumper\FileDumper" not found in D:\Apache24\www\trace\Backstage\vendor\symfony\translation\Dumper\YamlFileDumper.php:24 Stack trace: #0 {main} thrown in D:\Apache24\www\trace\Backstage\vendor\symfony\translation\Dumper\YamlFileDumper.php on line 24