以下为句子列表:
英文: During back substitution 2503 elements encounter a load applied to a degree of freedom that does not have any stiffness. The elements have been identified in element set WarnElemBackSubNoStiffStep1Inc1.
中文: 这个错误是什么意思?如何解决?字面上看一个荷载加到一个没有刚度的节点上怎么解释?谢谢!
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