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error to load dynamic service sample flex viewer 3.1

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Hi,

I want to use Sample Flex Viwer 3.1 but I have a error ...

In my config.xml, I have :

Code:

<map wraparound180="true" initialextent="287902 6740112 396133 6852402" fullextent="287902 6740112 396133 6852402" top="0" esrilogovisible="false" addarcgisbasemaps="false">
        <basemaps>
                          <layer label="Scan IGN" type="tiled" visible="true" url="http://other/arcgis/rest/services/SCAN/MapServer" />
                          <layer label="Fond départemental" type="tiled" visible="false" url="http://other/arcgis/rest/services/FondDepartemental/MapServer" />
          </basemaps>
     
        <operationallayers>
                <layer label="Territoire Départemental" type="dynamic" visible="true" url="http://ags101:6080/arcgis/rest/services/TERRITOIRE_DEPARTEMENTAL/MapServer"/>
                        <layer label="Esquisse" type="feature" visible="true" url="http://ags101:6080/arcgis/rest/services/ALERTE_VOIRIE_ESQUISSE/FeatureServer/0"/>
                <layer label="En attente" type="feature" visible="true" url="http://ags101:6080/arcgis/rest/services/ALERTE_VOIRIE_ATTENTE/FeatureServer/0"/>
                <layer label="En cours" type="feature" visible="true" url="http://ags101:6080/arcgis/rest/services/ALERTE_VOIRIE_EN_COURS/FeatureServer/0"/>
                <layer label="Clôturée" type="feature" visible="true" url="http://ags101:6080/arcgis/rest/services/ALERTE_VOIRIE_TRAITEE/FeatureServer/0"/>
                </operationallayers>
       
    </map>

I have this error :

Il est impossible d'accéder à la propriété ou à la méthode d'une référence d'objet nul.
Code:

at com.esri.ags.layers::ArcGISDynamicMapServiceLayer/loadMapImage()[C:\checkout\flex_api3\api\src\com\esri\ags\layers\ArcGISDynamicMapServiceLayer.as:1197]
        at com.esri.ags.layers::DynamicMapServiceLayer/updateLayer()[C:\checkout\flex_api3\api\src\com\esri\ags\layers\DynamicMapServiceLayer.as:183]
        at com.esri.ags.layers::Layer/updateLayerIfInvalid()[C:\checkout\flex_api3\api\src\com\esri\ags\layers\Layer.as:629]
        at com.esri.ags.layers::Layer/updateDisplayList()[C:\checkout\flex_api3\api\src\com\esri\ags\layers\Layer.as:555]
        at mx.core::UIComponent/validateDisplayList()
        at mx.managers::LayoutManager/validateDisplayList()
        at mx.managers::LayoutManager/doPhasedInstantiation()
        at mx.managers::LayoutManager/doPhasedInstantiationCallback()


what's the problem ?

The version 3.1 is it good ?

Thanks

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