Create Map Cache manual

Hello,
I'm trying to generate Map Caches from MapServices.
The reason is, i need to generate caches for given extents automatically.
Here is my approach with ArcObjects for .NET:

IMapDocument mapDocument = new MapDocument();
mapDocument.Open("d:/arcgisdata/Sachsen/webline_sachsen_stamm_ALK_Nutzung.mxd");
IMap map = mapDocument.get_Map(0);
IMapCooker mapCooker = new MapCooker();

// Giving the MapCooker the Extent of a Feature
mapCooker.Extent = feature.Extent;
ILayer layer = map.get_Layer(0);
// ILayer and Map are not NULL
// Where do I get my IDisplay-Object from?
ESRI.ArcGIS.Display.IDisplay display = new ESRI.ArcGIS.ArcMapUI.AppDisplay();

// Need I to add the Layer to the MapCooker?
mapCooker.AddLayer(layer.Name, layer);

if (map != null && layer != null)
{
mapCooker.Generate(map, layer, display, cancel);
}
else
{
Logger.Log("w", "Map und/oder Layer sind NULL. Cache konnte nicht erstellt werden.");
}
After calling mapCooker.Generate() i get the following error:
Exception HRESULT: 0x000000A. The data necessary to complete this operation is not yet available.

Has anyone an idea?

Thanks in advance.