一个Sonata列表视图上的“拒绝访问”，但另一个没有

I am working on a project based on Symfony 2.7 and Sonata Admin. I am logged in as a superuser, and I have two browser tabs open. On the first tab, I have successfully loaded the list view for a Video entity.

On the second tab, I try to load a new admin screen for an entity called VideoDerivative. Instead of the list view, I get an uncaught AccessDeniedException. Expanding the error shows that the following logic has been invoked in CRUDController.php:

public function listAction()
{
    if (false === $this->admin->isGranted('LIST')) {
        throw new AccessDeniedException();
    }

I find that interesting since, as I mentioned, I am able to view other entity types' list views just fine.

I'm not sure how to start debugging this. What would you do?

It turned out that I needed to create and assign these roles:

    ROLE_APP_ADMIN_VIDEO_DERIVATIVE_ALL:
        - ROLE_APP_ADMIN_VIDEO_DERIVATIVE_CREATE
        - ROLE_APP_ADMIN_VIDEO_DERIVATIVE_EDIT
        - ROLE_APP_ADMIN_VIDEO_DERIVATIVE_DELETE
        - ROLE_APP_ADMIN_VIDEO_DERIVATIVE_LIST
        - ROLE_APP_ADMIN_VIDEO_DERIVATIVE_WORKFLOW

Putting those into place (and giving my user access to them) fixed my issue.