Hi Blaz, I am using Hec Geo-HMS with ArcGIS 10, but on Windows 7. I am also facing the same error message not only at the basin model file generation step, but also during shape files creation step. Have you found the real reason of error and it's solution? Kindly let me know, because I have to input all the parameters like sub-basin area etc. manually in HMS otherwise. Thanks.
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