Hi asimghalib,

You are not specifying "-ng" flag. So it is trying to open GUI. Also, I see that you are not enabling HPC mode for your simulations. Or specifying machine list or number of cores etc.

I will repeat: Please go through the HFSS help thoroughly. All these things are already well documented there!

Also you need to load the MPI module on your slurm cluster ("module av" to check which MPI architecture is available). They are not usually loaded automatically.

Let me know if you don't understand anything from the documentation.