nonfunctioning kml in OL

map = new OpenLayers.Map("map", {'theme': null});
    var gmap = new OpenLayers.Layer.GoogleNG({type: google.maps.MapTypeId.HYBRID});
    var sheds = new OpenLayers.Layer.Vector("KML", {
        projection: map.displayProjection,
        strategies: [new OpenLayers.Strategy.Fixed()],
        protocol: new OpenLayers.Protocol.HTTP({
            url: "http://www.geosprocket.com/files/vthuc12a.kml",
            format: new OpenLayers.Format.KML({
                extractStyles: true,
                extractAttributes: true
            })
        })
});
map.addLayers([gmap,sheds]);