Fatal error: Uncaught Error: Class "Symfony\Component\Form\ChoiceList\Loader\CallbackChoiceLoader" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\form\ChoiceList\Loader\IntlCallbackChoiceLoader.php:20 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\form\ChoiceList\Loader\IntlCallbackChoiceLoader.php on line 20