DirectRender is not working

import QtQuick 2.0
import Qt3D 1.0
import Qt3D.Shapes 1.0

Viewport {
    width: parent.width; height: parent.height
    renderMode: "DirectRender"
    fillColor: "darkblue"
    objectName: "cube viewport"

    Cube {
        scale: 1.5
        objectName: "cube"

        transform: Rotation3D {
            angle: 45
            axis: Qt.vector3d(1,1,1)
        }

        effect: Effect {
            color: "#aaca00"
            decal: true
        }
    }
}