topic CNGrid not generating in Geoprocessing Questions https://community.esri.com/t5/geoprocessing-questions/cngrid-not-generating/m-p/531388#M17700 <HTML><HEAD></HEAD><BODY><SPAN>hi, I am uisnin ArcMap9.3 with Windows 7 32 bit. I installed HEC-GeoHMS, ArcHydro for watershed modelling. when i tried to generate CNGrid (input fil, Lulc_soil_union and CNLookup table) from utilities of HEC-GeoHMS, its doesnot generating CNGrid (Grid formate) and showing the massage below</SPAN><BR /><SPAN>" System.NullReferenceException: Object reference not set to an instance of an object.</SPAN><BR /><SPAN> at ESRI.APWR.HECGeoHMS9.GPGenerateCNGrid.GenerateCNGridWk(ApLayers apLayers, Int32 debug, ITrackCancel&amp; trackcancel, IGPMessages&amp; messages, String&amp; exMessage)</SPAN><BR /><SPAN>Failed to execute (GenerateCNGrid)."</SPAN><BR /><BR /><BR /><SPAN> </SPAN><BR /><SPAN>Pls anybody explain me</SPAN></BODY></HTML> Wed, 28 Nov 2012 08:43:48 GMT ibrahimbathis_k 2012-11-28T08:43:48Z CNGrid not generating https://community.esri.com/t5/geoprocessing-questions/cngrid-not-generating/m-p/531388#M17700 <HTML><HEAD></HEAD><BODY><SPAN>hi, I am uisnin ArcMap9.3 with Windows 7 32 bit. I installed HEC-GeoHMS, ArcHydro for watershed modelling. when i tried to generate CNGrid (input fil, Lulc_soil_union and CNLookup table) from utilities of HEC-GeoHMS, its doesnot generating CNGrid (Grid formate) and showing the massage below</SPAN><BR /><SPAN>" System.NullReferenceException: Object reference not set to an instance of an object.</SPAN><BR /><SPAN> at ESRI.APWR.HECGeoHMS9.GPGenerateCNGrid.GenerateCNGridWk(ApLayers apLayers, Int32 debug, ITrackCancel&amp; trackcancel, IGPMessages&amp; messages, String&amp; exMessage)</SPAN><BR /><SPAN>Failed to execute (GenerateCNGrid)."</SPAN><BR /><BR /><BR /><SPAN> </SPAN><BR /><SPAN>Pls anybody explain me</SPAN></BODY></HTML> Wed, 28 Nov 2012 08:43:48 GMT https://community.esri.com/t5/geoprocessing-questions/cngrid-not-generating/m-p/531388#M17700 ibrahimbathis_k 2012-11-28T08:43:48Z