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Hello, right now i am doing my project which is a 3 d printed arm robot and connected to my laptop using USB2dynamixel. I want to control this robot using MoveIt, but everytime I want to launch the robot_state.launch, this error always comes up

Traceback (most recent call last): File "/opt/ros/kinetic/lib/python2.7/dist-packages/rospy/topics.py", line 750, in _invoke_callback cb(msg) File "/home/richard/robot_ws/src/dxl_tutorial/scripts/state_publisher.py", line 37, in process joint_states.position.append((x.position-offset[x.id-1])(300.0/1023)(pi/180)) IndexError: list index out of range

I have already checked the state_publisher.py, but it seems like there is nothing wrong there. Can somebody please give some advice? I am also new to ROS.