Toposhaper error - help

Newbie to Toposhaper so forgive the rookie post - I get this error message running Toposhaper tong to create a terrain from a dxf file, (which works fine in Sandbox)

An error occurred in CALCULATING TERRAINS

The operation is fully aborted

no implicit conversion from nil to integer

Any ideas appreciated, thank you

You should post in the TopoShaper thread at Sketchucation. And share the model so we can see what you are starting from. Most likely you haven’t got the model set up correctly.

Thanks - will do!