Fatal error: Uncaught Error: Class "Symfony\Component\DependencyInjection\ServiceLocator" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\dependency-injection\Argument\ServiceLocator.php:21 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\dependency-injection\Argument\ServiceLocator.php on line 21