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