REQUIRED process [open_manipulator_dynamixel_controller-2] has died!

edit

I just tried to operate open manipulator system by using two motor(MX-106). When I launch that code, the following error occur.

roslaunch open_manipulator_dynamixel_ctrl dynamixel_controller.launch

I already let the USB accss allow, but it is not working too. What would I do to solve this error??

started roslaunch server http://localhost:*****/
SUMMARY

PARAMETERS

    /baud_rate: 1000000
    /device_name: /dev/ttyUSB0
    /rosdistro: kinetic
    /rosversion: 1.12.12
    /scan_range: 10

NODES
/
open_manipulator_dynamixel_controller (open_manipulator_dynamixel_ctrl/dynamixel_controller)

auto-starting new master
process[master]: started with pid [5590]
ROS_MASTER_URI=http://localhost:11311
setting /run_id to *****
process[rosout-1]: started with pid [5603]
started core service [/rosout]
process[open_manipulator_dynamixel_controller-2]: started with pid [5609]
[ INFO] [1520408424.601165791]: open_manipulator_dynamixel_controller : Init OK!
================================================================================REQUIRED process [open_manipulator_dynamixel_controller-2] has died!
process has died [pid 5609, exit code -11, cmd /home/user/catkin_ws/devel/lib/open_manipulator_dynamixel_ctrl/dynamixel_controller __name:=open_manipulator_dynamixel_controller __log:=/home/user/.ros/log/.../open_manipulator_dynamixel_controller-2.log].
log file: /home/user/.ros/log/.../open_manipulator_dynamixel_controller-2*.log
Initiating shutdown!

[open_manipulator_dynamixel_controller-2] killing on exit
[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done