At least one node is overconstrained for the current settings. Please check your boundary conditions for incompatible settings.
The solver failed to run the analysis due to overconstrained degrees of freedom (DOF) of one of the entity.
This error may occur when the slave contact surface nodes of linear or nonlinear contact are further constrained in any direction. Since during the calculation, the nodes of the slave surfaces are restricted in their movement by the deformation of the master surface, therefore, restricting slave node(s) further will lead to overconstrained system.
Make sure that the nodes which are part of the slave contact are not constrained in any direction. Even if you want to apply a symmetry boundary condition to the model involving contact, try to partition the symmetry face in to two so that a very small face sharing the slave contact nodes can be easily omitted from the symmetry constraint boundary condition. An example below explains the possible solution to one of the problem: