ansys13.0中，运行结果时出现如下提示：
section ID set 2 is undefined but is referenced by element 2；
section ID set 3 is undefined but is referenced by element 3；
section ID set 4 is undefined but is referenced by element 4；
。。。。
section ID set X is undefined but is referenced by element X；
截面实常数都一样的，为什么会这样呢，难道要一个个ID设置实常数吗？
求师兄师姐们帮忙解答下，谢谢了！
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