Fatal error: Uncaught Error: Interface "Symfony\Component\Form\DataTransformerInterface" not found in /home/palabrebel/www/kimai/src/Form/DataTransformer/TagArrayToStringTransformer.php:20 Stack trace: #0 {main} thrown in /home/palabrebel/www/kimai/src/Form/DataTransformer/TagArrayToStringTransformer.php on line 20