Fatal error: Uncaught Error: Interface "Symfony\Component\Form\DataTransformerInterface" not found in /home/u6668910/public_html/lab/src/Admin/CategoryBundle/Form/DataTransformer/CategoryToNumberTransformer.php:10 Stack trace: #0 {main} thrown in /home/u6668910/public_html/lab/src/Admin/CategoryBundle/Form/DataTransformer/CategoryToNumberTransformer.php on line 10