Fatal error: Uncaught Error: Class "Symfony\Component\Form\ChoiceList\Loader\AbstractChoiceLoader" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\form\ChoiceList\Loader\CallbackChoiceLoader.php:19 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\form\ChoiceList\Loader\CallbackChoiceLoader.php on line 19