一个面partition后产的内部的新的面接触

手指12

请问一下，平面问题中，一个面partition后产的内部的新的面，将他与一个刚体设置接触，最后出错显示
1 improperly defined surface(s). Please check your surface definitions. Make sure that all surface normals point outward.
One or more surfaces are ambiguously connected between some nodes. See the status file for further details.