Error: "ChoiceToJsonTransformer must implement ChoiceListInterface"

[sebastian87]

After submitting my form, I get the following error:

Catchable Fatal Error: Argument 1 passed to Genemu\Bundle\FormBundle\Form\Core\DataTransformer\ChoiceToJsonTransformer::__construct() must implement interface Symfony\Component\Form\Extension\Core\ChoiceList\ChoiceListInterface, instance of Symfony\Component\Form\ChoiceList\LegacyChoiceListAdapter given, called in /home/sebs/Projekte/CdsHelpdesk/vendor/genemu/form-bundle/Genemu/Bundle/FormBundle/Form/JQuery/Type/AutocompleterType.php on line 46 and defined

composer.json:
"symfony/symfony": "2.8.*",
"genemu/form-bundle": "^3.0@dev".

Didn't had this error with symfony 2.6 and genemu dev-master#ceea9d0d167aa75c7bc635d59e97e922e9e5f70e.

[wetternest]

same here