pan_tilt_port: No motors found + Dynamixel MX-64AR [closed]

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Hello,

I have attached a dynamixel motor MX-64AR via USB to my laptop. The distro of my ROS is indigo running of Ubuntu 14.04. I looked into other answers, but I couldn't solve my problem. When I run the following launch file:

<launch>
    <node name="dynamixel_manager" pkg="dynamixel_controllers" type="controller_manager.py" required="true" output="screen">
        <rosparam>
            namespace: dxl_manager
            serial_ports:
                pan_tilt_port:
                    port_name: "/dev/ttyUSB0"
                    baud_rate: 8000
                    min_motor_id: 1
                    max_motor_id: 4
                    update_rate: 20
        </rosparam>
    </node>
</launch>

I get the following output in the terminal:

SUMMARY
========

PARAMETERS
 * /dynamixel_manager/namespace: dxl_manager
 * /dynamixel_manager/serial_ports/pan_tilt_port/baud_rate: 8000
 * /dynamixel_manager/serial_ports/pan_tilt_port/max_motor_id: 4
 * /dynamixel_manager/serial_ports/pan_tilt_port/min_motor_id: 1
 * /dynamixel_manager/serial_ports/pan_tilt_port/port_name: /dev/ttyUSB0
 * /dynamixel_manager/serial_ports/pan_tilt_port/update_rate: 20
 * /rosdistro: indigo
 * /rosversion: 1.11.19

NODES
  /
    dynamixel_manager (dynamixel_controllers/controller_manager.py)

auto-starting new master
process[master]: started with pid [4794]
ROS_MASTER_URI=http://localhost:11311

setting /run_id to 86c272d8-28ba-11e6-817c-e09467568303
process[dynamixel_manager-2]: started with pid [4813]
/opt/ros/indigo/lib/python2.7/dist-packages/dynamixel_driver/dynamixel_serial_proxy.py:92: SyntaxWarning: The publisher should be created with an explicit keyword argument 'queue_size'. Please see http://wiki.ros.org/rospy/Overview/Publishers%20and%20Subscribers for more information.
  self.motor_states_pub = rospy.Publisher('motor_states/%s' % self.port_namespace, MotorStateList)
/opt/ros/indigo/lib/python2.7/dist-packages/dynamixel_driver/dynamixel_serial_proxy.py:93: SyntaxWarning: The publisher should be created with an explicit keyword argument 'queue_size'. Please see http://wiki.ros.org/rospy/Overview/Publishers%20and%20Subscribers for more information.
  self.diagnostics_pub = rospy.Publisher('/diagnostics', DiagnosticArray)
[INFO] [WallTime: 1464869228.261456] pan_tilt_port: Pinging motor IDs 1 through 4...
[FATAL] [WallTime: 1464869228.598303] pan_tilt_port: No motors found.
================================================================================REQUIRED process [dynamixel_manager-2] has died!
process has died [pid 4813, exit code 1, cmd /opt/ros/indigo/lib/dynamixel_controllers/controller_manager.py __name:=dynamixel_manager __log:=/home/mahsa/.ros/log/86c272d8-28ba-11e6-817c-e09467568303/dynamixel_manager-2.log].
log file: /home/mahsa/.ros/log/86c272d8-28ba-11e6-817c-e09467568303/dynamixel_manager-2*.log
Initiating shutdown!
================================================================================
[dynamixel_manager-2] killing on exit
[rosout-1] killing on exit
[master] killing on exit
shutting down processing monitor...
... shutting down processing monitor complete
done

Also I did : dmesg | grep tty and got:

[    0.000000] console [tty0] enabled
[  161.384192] usb 1-3: FTDI USB Serial Device converter now attached to ttyUSB0

Can anyone help me to solve the problem. Do I need to add more information in the launch file?

Thank you.