Hi i have a problem while trying to use goPay

[Fabricio872]

Sylius 1.2.12 with Symfony 4.1.7 returns:
Argument 1 passed to Payum\Core\Gateway::addAction() must implement interface Payum\Core\Action\ActionInterface, string given, called in /home/fabricio/PhpstormProjects/acme12/vendor/payum/payum/src/Payum/Core/CoreGatewayFactory.php on line 218

I found that those strings are
"payum.action.payum.action.set_gopay" => "@czende.gopay.gopay_action"
and
"payum.action.payum.action.notify" => "@czende.gopay.notify_action"

How could i fix this issue?
Thanks

[Jakub91]

Try change symfony version to 3.4.*