Arm does not appear when using xacro to attach UR5 to Robotiq Gripper

I am trying to attach a Robotiq 2f gripper to a UR5 arm, but cannot get the two components to properly connect to one another. Following the tutorial [here](http://wiki.ros.org/Industrial/Tutorials/WorkingWithRosIndustrialRobotSupportPackages#Example:_adding_an_end-effector_to_a_robot), I created the xacro file below, but only the gripper appears when I launch the MoveIt Setup Assistant and load the xacro. I don't see any errors. How do I properly attach the gripper to the arm for simulation? I have cloned the most recent industrial packages for Universal Robots and Robotiq and am running Ubuntu 18.04.