下面错误怎么纠正，求大家指教
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下面错误怎么纠正，求大家指教，在这提前谢谢啦，呵呵
*** ERROR *** CP = 192.349 TIME= 10:17:39
All nodes in PML with the element coordinate system number 0 have PEC
boundary condition. Please check the model. The NUMMRG command may
help.
*** ERROR *** CP = 192.349 TIME= 10:17:39
All nodes in PML with the element coordinate system number 0 have PEC
boundary condition. Please check the model. The NUMMRG command may
help.
fushihu2013 
