Fatal error: Uncaught Error: Interface "Symfony\Component\Form\DataTransformerInterface" not found in /home/kakabapu/public_html/mysticker.kakabapu.com/vendor/friendsofsymfony/user-bundle/FOS/UserBundle/Form/DataTransformer/UserToUsernameTransformer.php:15 Stack trace: #0 {main} thrown in /home/kakabapu/public_html/mysticker.kakabapu.com/vendor/friendsofsymfony/user-bundle/FOS/UserBundle/Form/DataTransformer/UserToUsernameTransformer.php on line 15