FATAL ERROR: Unhandled c0000409h Exception at 31d624dah

[techs]

I'm running Carson 2010 on AutoCad 2010. When I try to draw a 3d poly and use "Surface Model from File" after one or two clicks I get "FATAL ERROR: Unhandled c0000409h Exception at 31d624dah" I've tried multiple drawing and multiple DTMs. Anyone got any ideas on what the problem could be?

[site admin]

Please send your question to support@carlsonsw.com

please attach your drawing and surface file so we can test the issue here.

thank you
Carlson Support