Your original error implied that actors was an array and element [i] of the array did not have a property/field named 'id'. It is caused by the reference to actors[i].id in this line:

CF.widget("BTN_ON_" + (i+1)).onPress = PowerOnUnit(actors[i].id);


Have you examined exactly what is being returned by the JSON script into the variable named data? Are you sure the content is correct?

I am also curious as to why you need the closure? The closure should work properly but I'm not sure why you need it.

Please see next post. Posted again vs editing!