Hi, im currently working or beginner in HEC geoHMS,after sucessfully completing "soil_landuse_Union" and "CN look up" table as per Hec geoHMS user manual 4.2, when i started generating CN grid it shows error like.....
System.ArgumentException: Item has already been added. Key in dictionary: '3' Key being added: '3'
at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)
at System.Collections.Hashtable.Add(Object key, Object value)
at ESRI.APWR.HECGeoHMS10.GPGenerateCNGrid.GenerateCNGridWk(ApLayers apLayers, Int32 debug, ITrackCancel& trackcancel, IGPMessages& messages, String& exMessage)
Failed to execute (GenerateCNGrid). Failed at Fri Jun 15 01:24:14 2018 (Elapsed Time: 0.00 seconds)
Can you please find solution for it...
please mail me at @ rohitcivilme@gmail.com
