ABAQUS 耦合定义问题

Whenever a translation (rotation) dof at a node is constrained by a kinematic coupling definition the translation (rotation) dofs for that node cannot be included in any other constraint including mpcs, rigid bodies, etc.
MPCS (EXTERNAL or INTERNAL, including those generated from rigid body definitions), KINEMATIC COUPLINGS, AND/OR EQUATIONS WILL ACTIVATE ADDITIONAL DEGREES OF FREEDOM

算塔架模型的时候出现这种错误，说是耦合定义有问题，我用的约束方程，约束了六个自由度，之前桁架外面没有加套架时候可以算，加了后就不能算了，请问错误可能出现在哪里吗？