topic generation of CN grid showing error in Water Resources Questions https://community.esri.com/t5/water-resources-questions/generation-of-cn-grid-showing-error/m-p/201728#M949 <HTML><HEAD></HEAD><BODY><P>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.....</P><P>System.ArgumentException: Item has already been added. Key in dictionary: '3' Key being added: '3'<BR /> at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)<BR /> at System.Collections.Hashtable.Add(Object key, Object value)<BR /> at ESRI.APWR.HECGeoHMS10.GPGenerateCNGrid.GenerateCNGridWk(ApLayers apLayers, Int32 debug, ITrackCancel&amp; trackcancel, IGPMessages&amp; messages, String&amp; exMessage)<BR />Failed to execute (GenerateCNGrid). Failed at Fri Jun 15 01:24:14 2018 (Elapsed Time: 0.00 seconds)</P><P>Can you please find solution for it...</P><P><SPAN>please mail me at @&nbsp;&nbsp; </SPAN><A class="jive-link-email-small" href="mailto:rohitcivilme@gmail.com">rohitcivilme@gmail.com</A></P></BODY></HTML> Thu, 14 Jun 2018 20:44:29 GMT Rohit_Nayak 2018-06-14T20:44:29Z generation of CN grid showing error https://community.esri.com/t5/water-resources-questions/generation-of-cn-grid-showing-error/m-p/201728#M949 <HTML><HEAD></HEAD><BODY><P>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.....</P><P>System.ArgumentException: Item has already been added. Key in dictionary: '3' Key being added: '3'<BR /> at System.Collections.Hashtable.Insert(Object key, Object nvalue, Boolean add)<BR /> at System.Collections.Hashtable.Add(Object key, Object value)<BR /> at ESRI.APWR.HECGeoHMS10.GPGenerateCNGrid.GenerateCNGridWk(ApLayers apLayers, Int32 debug, ITrackCancel&amp; trackcancel, IGPMessages&amp; messages, String&amp; exMessage)<BR />Failed to execute (GenerateCNGrid). Failed at Fri Jun 15 01:24:14 2018 (Elapsed Time: 0.00 seconds)</P><P>Can you please find solution for it...</P><P><SPAN>please mail me at @&nbsp;&nbsp; </SPAN><A class="jive-link-email-small" href="mailto:rohitcivilme@gmail.com">rohitcivilme@gmail.com</A></P></BODY></HTML> Thu, 14 Jun 2018 20:44:29 GMT https://community.esri.com/t5/water-resources-questions/generation-of-cn-grid-showing-error/m-p/201728#M949 Rohit_Nayak 2018-06-14T20:44:29Z