Do you have remote displacement and/or remote force loads defined in the model? Ansys uses contact technology to generate the surface based constraint equations used for these types of loads. The target elements are the master nodes and KEYO(11) is a reference to relaxation method used in the constraint equations. Refer to the MAPDL Elements Reference Manual for TARGE170 for more information.
It appears you have scoped regions (surfaces and/or edges) that are overlapping and the CEs are conflicting with each other. You might also have MPC bonded and/or no-separation pairs that are interfering with each other.
If that description speaks to your application, can you try to change your scoping or your method of applying these loads to eliminate these overlaps?