Large deflection effects are not included for element type……

我做的是ANSYS电磁场分析，存在空气场，我在预处理中增加定义了空气材料的介电常数为1，求解时提醒 Large deflection effects are not included for element type ……；如果不定义空气介电常数，就不会出现这个提醒，但是求解结果不收敛，求大神指点~~感激不尽啊