Workbench里如何设置contactallowempty=1？

最近分析结构时间出现一下报错：

“At least one contact pair has no elements in it.  This may be due to mesh defeaturing.  Please modify defeaturing settings which are accessible on the Mesh object.   You may select the offending pair via RMB on this warning in the Messages window.”

几经折腾后查到可以试试把contactallowempty设置为1。但是研究了半天还是找不到这个如何去设置，不知道有没有哪位前辈能指导一下如何设置，或者能够很好地解决这个问题。

谢谢啦