Fatal error: Uncaught Error: Class "Doctrine\Common\DataFixtures\Loader" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\doctrine-bridge\DataFixtures\ContainerAwareLoader.php:26 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\doctrine-bridge\DataFixtures\ContainerAwareLoader.php on line 26