Hi All, Let me explain my Problem. I have two geometries (say A and B ) I created mesh individually for both of them in ICEM. Then in ICEM, I brought both meshes together and saved the .uns file. I read it in AcuConsole and it showed me the Mesh. While converting the Mesh to Discrete Geometry, I got the following error. ACUSIM: There are <20218> intersections in the input mesh ACUSIM: *** ASSERTION in Function <agsGetNumSimRegions> File <agsUtils.cpp> Line <1375> ACUSIM: *** Simulation model is null I have tried almost everything, but I dont quite understand why the Mesh is read correctly and why while converting to Discrete Geometry, it gives and error. Any help on this would be very appreciated. Regards, Juzer