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Alright guys, I figured it out.
spawner(rover_name, str(open("/home/anh/catkin_ws/src/rover_project/rover_description/urdf/rover.urdf",'r')), "/rover", Pose(position= Point(0,0,2),orientation=Quaternion(0,0,0,0)),"world")
should be
spawner(rover_name, open("/home/anh/catkin_ws/src/rover_project/rover_description/urdf/rover.urdf",'r').read(), "/rover", Pose(position= Point(0,0,2),orientation=Quaternion(0,0,0,0)),"world")
instead!
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