Geo-Ras Error whilst delineating floodplains

Discussion created by thaeusler on Jul 19, 2011
Hi All,

I am using Georas 4.3.93 with ArcGIS 9.3.1.

I have a georas project set up which uses the tile method with about 50 different TINs.  I have imported my RAS data back in, delineated the water surface, and am at the stage of "floodplain delineation using Grid" and I receive an error message each time:

"Failed to create mask feature class
System.NullReferenceException:Object reference not set to an instance of an object.
at ESRI.ArcGIS.Geometry.ITopologicalOperator2.Intersect(IGeometry other, esriGeometryDimension resultDimension)
at HECGeoRAS.clsMFloodGRIDIntersection.GetMaskFeatureClass4Tile(IFeature pTileFeature, String sProfilename, IFeatureClass pBPFC, Boolean IsMaskTilePolygon)"

Can anyone shed any light on what is going wrong?