topic HEC GeoHMS Thiessen Poloygons Error Message in Water Resources Questions https://community.esri.com/t5/water-resources-questions/hec-geohms-thiessen-poloygons-error-message/m-p/457528#M2277 <HTML><HEAD></HEAD><BODY><SPAN>Hi, </SPAN><BR /><BR /><SPAN>When I attempt to create Thiessen Polygons using Utility tools, I get the following message: </SPAN><BR /><SPAN>System.NullReferenceException: Object reference not set to an instance of an object.</SPAN><BR /><SPAN>&nbsp;&nbsp; at ESRI.APWR.ArcHydroGPTools.AHThiessenPolygon.Execute(IArray paramvalues, ITrackCancel trackcancel, IGPEnvironmentManager envMgr, IGPMessages message)</SPAN><BR /><SPAN>Failed to execute (CreateThiessenPolygons).</SPAN><BR /><BR /><SPAN>I also attached a pop-up error message that I received. Does anyone know what is going wrong here?</SPAN><BR /><BR /><SPAN>Thanks!</SPAN><BR /><SPAN>Mike</SPAN></BODY></HTML> Wed, 22 Jun 2011 14:00:33 GMT MichaelBrady 2011-06-22T14:00:33Z HEC GeoHMS Thiessen Poloygons Error Message https://community.esri.com/t5/water-resources-questions/hec-geohms-thiessen-poloygons-error-message/m-p/457528#M2277 <HTML><HEAD></HEAD><BODY><SPAN>Hi, </SPAN><BR /><BR /><SPAN>When I attempt to create Thiessen Polygons using Utility tools, I get the following message: </SPAN><BR /><SPAN>System.NullReferenceException: Object reference not set to an instance of an object.</SPAN><BR /><SPAN>&nbsp;&nbsp; at ESRI.APWR.ArcHydroGPTools.AHThiessenPolygon.Execute(IArray paramvalues, ITrackCancel trackcancel, IGPEnvironmentManager envMgr, IGPMessages message)</SPAN><BR /><SPAN>Failed to execute (CreateThiessenPolygons).</SPAN><BR /><BR /><SPAN>I also attached a pop-up error message that I received. Does anyone know what is going wrong here?</SPAN><BR /><BR /><SPAN>Thanks!</SPAN><BR /><SPAN>Mike</SPAN></BODY></HTML> Wed, 22 Jun 2011 14:00:33 GMT https://community.esri.com/t5/water-resources-questions/hec-geohms-thiessen-poloygons-error-message/m-p/457528#M2277 MichaelBrady 2011-06-22T14:00:33Z