I am using OpenSees windows Current version 3.0.3 I modeled a 3d structure with a shear wall. I used a multi-layer shell element for the simulation of shear wall components. PSUMAT - NOT DEFINED IN THIS VERSION, SOURCE CODE RESTRICTED error is halting me. nDmaterial PlaneStressUserMaterial is used to create the multi-dimensional concrete material model. 1. Can this material or any material related to this error be used in this version or do I need to change to other versions? 2. The windows version has some bugs, will using mac version solve the error?