[Users] print a map doesn't work correctly with my layers

[hassane allouch]

Hello

i tried the exemple:  http://api.geoext.org/1.0/examples/print-extent.html
(i'm using geoserver 2.1.0)

but i got in the pdf just the title but not the map (i joined it).  with the
layer

("Tasmania", "http://demo.opengeo.org/geoserver/wms",
            {layers: "topp:tasmania_state_boundaries"}, {singleTile: true})],

it works, but with mine it doesn't

this is the code:

var mapPanel, printProvider;

Ext.onReady(function() {
    // The printProvider that connects us to the print service
    printProvider = new GeoExt.data.PrintProvider({
        method: "GET", // "POST" recommended for production use
        capabilities: printCapabilities, // from the info.json script in the
html
        customParams: {
            mapTitle: "Printing Demo",
            comment: "This is a map printed from GeoExt."
        }
    });

    var printExtent = new GeoExt.plugins.PrintExtent({
        printProvider: printProvider
    });

    // The map we want to print, with the PrintExtent added as item.
    mapPanel = new GeoExt.MapPanel({
        renderTo: "content",
        width: 450,
        height: 320,
        layers: [new OpenLayers.Layer.WMS("
province",     "http://localhost:8080/geoserver/wms",
            {layers: "sf:province"}, {singleTile: true})],
        center: [-7.50,33.5],
        zoom: 6,
        plugins: [printExtent],
        bbar: [{
            text: "Create PDF",
            handler: function() {
                // the PrintExtent plugin is the mapPanel's 1st plugin
                mapPanel.plugins[0].print();
            }
        }]
    });
    printExtent.addPage();
});


thank you
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