Hi @shashank1, 

Would you please let me know if you find a solution for this? 

When doing validation check, two imported objects intersected, so I tried to do subtraction. But I had the same error about “Two or more vertices of one body mapped to a single entity of other body”. My model is a 3D rat head with 2 layers, skull and outer layer (or muscle) imported into HFSS. I did intersection as recommended in “Model Prep Commands”, and it gave me below image. I tried every options in that section, but none seems to work.