Dynamic node config function returning array broken

Does this sort of anonymous function returning an array still work?

Something about errorBackend is not defined.

My code is something like this, nested inside a SceneJS.materials():

(function() {

   var row = [];
   for (var i = 0; i < 4; i++) {
           row.push(
                   SceneJS.translate({ x: map[i].x+map[i].width/2, y: map[i].y+map[i].height/2 },
                           SceneJS.scale({x: map[i].width, y: map[i].height, z: 2.0},
                                   SceneJS.objects.cube()
                           ) // scale
                   ) // translate
           );
   }
   return row;

})() // Anon

although simpler code (below) gives the same error.

[ SceneJS.objects.cube(), SceneJS.objects.cube() ]

(Using Minefield/3.7a5pre with SceneJS 0.7.2)