I am a newbie to SW and I have a issue with mates in an assembly. I am trying to build a desktop CNC using parts and sub-assemblies. I seem to have figured out how to mate pates and align things in the assembly, however, once I try to mate the X-Gantry-Plate<1>(Left) to the X-Gantry with a  concentric (Conentric8) mate between SW complains saying that my assembly is over defined (and places warnings over 7 other mates). If I delete or suppress a Cincentric4 mate then the assembly becomes fully defined again. I really need some help as it is preventing me from moving forward with my build