Fatal error: Uncaught Error: Interface "Symfony\Component\Validator\GroupSequenceProviderInterface" not found in C:\AppServ\www\greenhess-storage\vendor\symfony\validator\Tests\Fixtures\GroupSequenceProviderEntity.php:20 Stack trace: #0 {main} thrown in C:\AppServ\www\greenhess-storage\vendor\symfony\validator\Tests\Fixtures\GroupSequenceProviderEntity.php on line 20