Need help: Error whenever trying to simulate periodic boundary condition in RF module

Hi Everybody,

I'm trying to do 3D RF module simulation with periodic boundary condition on the sides. Every time i start the computation, i keep getting an error that says :

Unknown function or operator.
- Name: mod1.emw.dst2src_pc1

I guess this error is related to the periodic boundary condition as when i run it with perfect conductor boundaries it works fine. Does this mean my comsol do not have this function or something?


Thanks in advance for any assistance / suggestion