HEC GeoHMS Thiessen Poloygons Error Message

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06-22-2011 07:00 AM
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MichaelBrady
New Contributor
Hi,

When I attempt to create Thiessen Polygons using Utility tools, I get the following message:
System.NullReferenceException: Object reference not set to an instance of an object.
   at ESRI.APWR.ArcHydroGPTools.AHThiessenPolygon.Execute(IArray paramvalues, ITrackCancel trackcancel, IGPEnvironmentManager envMgr, IGPMessages message)
Failed to execute (CreateThiessenPolygons).

I also attached a pop-up error message that I received. Does anyone know what is going wrong here?

Thanks!
Mike
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