QML DocumentGalleryModel Element example does not work on Symbian^3

import Qt 4.7
import QtMobility.gallery 1.1

Rectangle {
    width: 1024
    height: 768

    GridView {
        anchors.fill: parent
        cellWidth: 128
        cellHeight: 128

        model: DocumentGalleryModel {
            rootType: DocumentGallery.Image
            properties: [ "url" ]
            filter: GalleryWildcardFilter {
                property: "fileName";
                value: "*.jpg";
            }
        }

        delegate: Image {
            source: url
            width: 128
            height: 128
        }
    }
}