Fatal error: Uncaught Error: Interface "Symfony\Component\Validator\Mapping\Loader\LoaderInterface" not found in I:\www\frameworks\Symfony\doctrine\vendor\symfony\validator\Mapping\Loader\LoaderChain.php:26 Stack trace: #0 {main} thrown in I:\www\frameworks\Symfony\doctrine\vendor\symfony\validator\Mapping\Loader\LoaderChain.php on line 26