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?