Fatal error: Uncaught Error: Interface "Symfony\Component\Form\DataTransformerInterface" not found in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Form\DataTransformer\UserToUsernameTransformer.php:26 Stack trace: #0 {main} thrown in C:\xampp\htdocs\BK\bateriasec\vendor\friendsofsymfony\user-bundle\Form\DataTransformer\UserToUsernameTransformer.php on line 26