求助 HFSS 仿真问题

  各位前辈，我方开始用HFSS这个软件，在仿微带线的互耦问题，但是仿真总会报错：[table=1275,#ffffff,,0][tr][td=7,1,1275]“Port refinement, process hf3d error: Failed to solve the problemdue to lack of precision. The likely cause is that the frequency is too low.”
我不知道到底是什么地方设置不对引起的，还请各位前辈给指点迷津啊！
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The likely cause is that the frequency is too low.”