Simscape Multibody rigid transformation error

Hello there i am trying to simulate a gantry 3 axis mechanisam with combination different mechanical actuation in multibody simulation i have divided the whole assembly in two parts one with the two axis belt driven actuation and the second one is a pulley driven actuation. i have dfined the orientations of these blocks in seaperate files and later created subsystems from them and tried to assembly them in single workspace but i am continously getting this same kind of error as show in the below picture what