关于HFSS下仿真半球介质的问题

请问在HFSS下仿真半球形的介质，要如何设置才不会出现以下的错误提示呢?
surface recovery failure possible reasons: (1) model has multiple objects with thin layers. (2) complex model with object overlapping. (3)true surfaces are skewed.
个人没发现有什么问题，但为什么会显示这样的呢?
希望高人可以回答，谢谢

同问啊！