[Users] Problem using Google as base layer...

[Paul james]

Hello guys...

I´m getting that error when use Google maps as my base layer:
Error: 'null' is null or not an object

Method :
 zoomToExtent: function(bounds, closest) {
 var center = bounds.getCenterLonLat();  <======== Error, bounds null


My code:
Ext.onReady(function() {
 map = new OpenLayers.Map('Map', {
        projection:new OpenLayers.Projection("EPSG:900913"),
        units: "m",
        displayProjection: new OpenLayers.Projection("EPSG:4326"),
        tileSize: new OpenLayers.Size(400, 400),
         maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,
20037508.34, 20037508.34),
        numZoomLevels: 10
    });


 viewport = new Ext.Viewport({
        forceFit: true,
        hideMode: "offsets",
        layout: "border",
        hideBorders: true,
        items: [
            {
                id: 'page-header-panel',
                region: "north",
                contentEl: "divMenu",
                height: 87
            },
            {
                id: 'page-center',
                region: 'center',
                layout: 'fit',
                frame: false,
                border: false,
                margins: '5 2 2 0',
                items: [CreateMapPanel(map)]
            }
       ]
    });

});


CreateMapPanel = function(__map) {
    var _mapfile = GetMapFileLocation();

   var _google = new OpenLayers.Layer.Google("Google Physical",
         {
            'type': G_PHYSICAL_MAP,
            maxExtent: new OpenLayers.Bounds(-20037508.34, -20037508.34,
20037508.34, 20037508.34),
           'sphericalMercator': true
         }
    );

   //Overlay
    var _testOverlay= new OpenLayers.Layer.WMS("TestOverlay",
                _mapfile, {
                    "LAYERS": ['TestOverlay'],
                    transparent: true,
                    format: "image/png"
                }, {
                    isBaseLayer: false,
                    tileSize: new OpenLayers.Size(400,400),
                    buffer: 0,
                    visibility: true
                });

    return new GeoExt.MapPanel({
        border: true,
        region: "center",
        xtype: "gx_mappanel",
        tbar: MakeToolBar(__map),
        map: __map,
        zoom: 1,
        layers: [_google,_testOverlay]
    });
}
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