Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\Dumper\Dumper" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\dependency-injection\Dumper\YamlDumper.php:38 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\dependency-injection\Dumper\YamlDumper.php on line 38