abaqus过约束怎么办？

我将网格从hypermesh导入abaqus，进行耦合，结果分析时这样

1 nodes are used more than once as a slave node in *TIE keyword. These constraints are not removed either due to the presence of *CONSTRAINT CONTROLS,NO CHANGES keyword or because removing the constraints might affect the model. The nodes have been identified in node set ErrNodeOverconTieSlave.

我查看了我建的约束，只有一个，边界条件也并不在这个点上，

*Node

  *Nset, nset=ASSEMBLY_M_SET-2

  *Nset, nset=ASSEMBLY_SET-1

  *Nset, nset=ASSEMBLY_SET-4

  *Nset, nset=ASSEMBLY_S_SET-2

  *surface, type=NODE, name=ASSEMBLY_S_SET-2_CNS_

  *surface, type=NODE, name=ASSEMBLY_S_SET-2_CNS_

  *coupling, constraintname=ASSEMBLY_CONSTRAINT-1, refnode=ASSEMBLY_M_SET-2, surface=ASSEMBLY_S_SET-2_CNS_

  *coupling, constraintname=ASSEMBLY_CONSTRAINT-1, refnode=ASSEMBLY_M_SET-2, surface=ASSEMBLY_S_SET-2_CNS_

  *coupling, constraintname=ASSEMBLY_CONSTRAINT-1, refnode=ASSEMBLY_M_SET-2, surface=ASSEMBLY_S_SET-2_CNS_

请问各位大神，怎么回事呀，要怎么改呀