Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Class name must be a valid object or a string in /var/www/nvon.nl/vendor/sensio/framework-extra-bundle/Request/ParamConverter/ParamConverterManager.php:66 Stack trace: #0 /var/www/nvon.nl/vendor/sensio/framework-extra-bundle/Request/ParamConverter/ParamConverterManager.php(49): Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterManager->applyConverter(Object(Symfony\Component\HttpFoundation\Request), Object(Sensio\Bundle\FrameworkExtraBundle\Configuration\ParamConverter)) #1 /var/www/nvon.nl/vendor/sensio/framework-extra-bundle/EventListener/ParamConverterListener.php(83): Sensio\Bundle\FrameworkExtraBundle\Request\ParamConverter\ParamConverterManager->apply(Object(Symfony\Component\HttpFoundation\Request), Array) #2 [internal function]: Sensio\Bundle\FrameworkExtraBundle\EventListener\ParamConverterListener->onKernelController(Object(Symfony\Component\HttpKernel\Event\FilterControllerEvent), 'kernel.controll...', Object(Symf in /var/www/nvon.nl/vendor/sensio/framework-extra-bundle/Request/ParamConverter/ParamConverterManager.php on line 66