The type or namespace name `WSA' does not exist in the namespace `UnityEngine.VR'

Open the Hololens Origami project using unity5.4.0b9,Error “ The type or namespace name WSA' does not exist in the namespace UnityEngine.VR’ ”

From what I’ve noticed is it won’t work with Unity 5.4.x versions. I got it working on Unity 5.5.2f1