Fatal error: Uncaught Error: Interface "Symfony\Component\Form\DataTransformerInterface" not found in /home/fotonoma/public_html/wallabag/vendor/kphoen/rulerz-bridge/Form/SpecificationToStringTransformer.php:7 Stack trace: #0 {main} thrown in /home/fotonoma/public_html/wallabag/vendor/kphoen/rulerz-bridge/Form/SpecificationToStringTransformer.php on line 7