port refinemnet HF3 error.port has no material inside it

through simulation I got these 2 errors
1.simulation terminated due to error on server
2.port refinement .process hf3d error port doesn't not have a solved inside material on either side .
please experts help me
thanks
regards

It sounds like your HFSS waveport is not making contact with some sort of dielectric (or vacuum), which it needs to.