Fatal error: Uncaught Error: Interface "Symfony\Component\Form\DataTransformerInterface" not found in /home/fotonoma/public_html/wallabag/vendor/friendsofsymfony/user-bundle/Form/DataTransformer/UserToUsernameTransformer.php:24 Stack trace: #0 {main} thrown in /home/fotonoma/public_html/wallabag/vendor/friendsofsymfony/user-bundle/Form/DataTransformer/UserToUsernameTransformer.php on line 24