I've been really struggling with creating a site model on VW Architect 2020 from some contour lines that I received in dwg format. They came in 3D, and I have also tried flattening them and creating a site model from 2D (AEC>Terrain>Site Model from Source Data). Neither works - the product is a red square with a cross in it, nothing is generated. I've tried playing around with the parameters of the Site Model Settings, checked that there's no conflicts in the lines and also tried doing the same thing in VW 2018 - same result. If anyone is able to give me some suggestions that would be much appreciated!! I've linked the file here.