error when changing language

Hello !
I get this error when I change or add a language in the setting-> system setting-> Localization & Internationalization
when I save to take into account the change of language, it turns for 10 minutes and displays this error. someone can explain to me please

Argument 1 passed to Sensio\Bundle\FrameworkExtraBundle\EventListener\ControllerListener::getConfigurations() must be of the type array, null given, called in /var/www/html/pimcore/vendor/sensio/framework-extra-bundle/EventListener/ControllerListener.php on line 61