[mapguide-users] View WMS in Maestro - "Object reference not set to an instance of an object"

[johan.asplund at karlstad.se]

Hi!

I have a problem to view data from a WMS-service in MapGuide Mastro v 3.5 
with MapGuide version 2.2.

I do the following:
1. Add WMS-data source --> test connection (as WMS version 1.1.1): "FDO 
Connection Status: True" --> advanced: all layers in this service are 
listed

2. Add Raster Layer Definition --> point to the WMS-data source created in 
step one and save --> I hit "Preview" and get the following message: 
"Object reference is not set to an instance of an obejct"
Details:
System.NullReferenceException: Objektreferensen har inte angetts till en 
instans av ett objekt.
   vid 
OSGeo.MapGuide.ObjectModels.MapDefinition_1_0_0.MapDefinition.OnFirstLayerAdded(MapLayerType 
layer) i 
d:\Workspace\maestro-3.0\OSGeo.MapGuide.MaestroAPI\ObjectModels\MapDefinition.cs:rad 
290
   vid 
OSGeo.MapGuide.ObjectModels.MapDefinition_1_0_0.MapDefinition.AddLayer(String 
groupName, String layerName, String resourceId) i 
d:\Workspace\maestro-3.0\OSGeo.MapGuide.MaestroAPI\ObjectModels\MapDefinition.cs:rad 
270
   vid 
Maestro.Base.Editor.ResourcePreviewEngine.GenerateLayerPreviewUrl(IResource 
res) i 
d:\Workspace\maestro-3.0\Maestro.Base\Editor\ResourcePreviewEngine.cs:rad 
73
   vid 
Maestro.Base.Editor.ResourcePreviewEngine.GeneratePreviewUrl(IResource 
res) i 
d:\Workspace\maestro-3.0\Maestro.Base\Editor\ResourcePreviewEngine.cs:rad 
260
   vid Maestro.Base.Editor.EditorContentBase.SetupPreviewUrl(String 
mapguideRootUrl) i 
d:\Workspace\maestro-3.0\Maestro.Base\Editor\EditorContentBase.cs:rad 255
   vid Maestro.Base.Commands.PreviewResourceCommand.Run() i 
d:\Workspace\maestro-3.0\Maestro.Base\Commands\PreviewResourceCommand.cs:rad 
49
   vid ICSharpCode.Core.WinForms.ToolBarCommand.OnClick(EventArgs e)
   vid System.Windows.Forms.ToolStripItem.HandleClick(EventArgs e)
   vid System.Windows.Forms.ToolStripItem.HandleMouseUp(MouseEventArgs e)
   vid System.Windows.Forms.ToolStripItem.FireEventInteractive(EventArgs 
e, ToolStripItemEventType met)
   vid System.Windows.Forms.ToolStripItem.FireEvent(EventArgs e, 
ToolStripItemEventType met)
   vid System.Windows.Forms.ToolStrip.OnMouseUp(MouseEventArgs mea)
   vid System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons 
button, Int32 clicks)
   vid System.Windows.Forms.Control.WndProc(Message& m)
   vid System.Windows.Forms.ScrollableControl.WndProc(Message& m)
   vid System.Windows.Forms.ToolStrip.WndProc(Message& m)
   vid System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& 
m)
   vid System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& 
m)
   vid System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, 
IntPtr wparam, IntPtr lparam)


The WMS-service is produced from our ArcGIS Server 10 and works fine in, 
for instance, Quantum GIS. 

At the same time I am able to view, in Maestro, a WMS-service provided 
from a server not controlled by us which makes me think something is wrong 
with the configuration of our ArcGIS server?? 

Any ideas on whats causing this behavior?

Thanks

//Johan
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