编程问题，程序没有问题，每次打开都报这样的错误，用的曲面驱动策略。

厲性范围：

GDZ_2_C0PY_C0PY_1

Surface_Area_911

This operation has two surfaces forming a complete loop. It is possible for the material side or tool axis to be flipped when rege nerating. Check this and adjust if necessary.