请问这个问题怎么解决啊？
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Solver problem. Zero pivot when processing D.O.F. 2 of 24 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_2_1_1_1_1.
Solver problem. Zero pivot when processing D.O.F. 3 of 25 nodes. The nodes have been identified in node set WarnNodeSolvProbZeroPiv_3_1_1_1_1.
0主元，这是约束没加好啊。