Null Camera

The camera is found to be null, so none of the mounting code will work. This is straight from a new Platformer Starter Game:

T2DSceneCamera camera = _sceneObject.SceneGraph.Camera as T2DSceneCamera;
            if (camera != null)
            {
                camera.Mount(_actor, String.Empty, new Vector2(0, -1), 0.0f, true);
                camera.UseMountForce = true;
                camera.MountForce = 15;
                camera.UseCameraWorldLimits = false;
                camera.CameraWorldLimitMin = new Vector2(-1000, -1000);
                camera.CameraWorldLimitMax = new Vector2(1000, 1000);
            }