HFSS仿真提示错误的原因

    [error] Port refinement, process hf3d error: Too few conductors were found on port 1.  There should be one conductor for each terminal, with one additional reference conductor.  Unintentional contact between conductors may cause this error..     [error] Simulation completed with execution error on server: Local Machine.
提示以上错误是什么原因呀?