Dynamixel problem : No motors found

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Hi !

I just got a new computer on which I installed ros groovy.

I am trying to use Dynamixel motors but I have an error. This error doesn't appear each time I launch the script so it's why I don't understand what's happening.

Below is the error :

[INFO] [WallTime: 1371628756.187555] pan_tilt_port: Pinging motor IDs 1 through 25...
[INFO] [WallTime: 1371628756.271966] pan_tilt_port controller_spawner: waiting for controller_manager dxl_manager to startup in global namespace...
[FATAL] [WallTime: 1371628758.257885] pan_tilt_port: No motors found.
================================================================================
REQUIRED process [dynamixel_manager-2] has died!

Here is my 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/Motors"
                    baud_rate: 1000000
                    min_motor_id: 1
                    max_motor_id: 25
                    update_rate: 20
        </rosparam>
    </node>

    <!-- Start tilt joint controller -->
    <rosparam file="$(find emox_dynamixel)/tilt.yaml" command="load"/>

    <node name="tilt_controller_spawner" pkg="dynamixel_controllers" type="controller_spawner.py"
          args="--manager=dxl_manager
        --port=pan_tilt_port
        base_tilt_controller
        pico_tilt_controller
        pan_controller
        tilt_controller"
          output="screen"/>
</launch>

The strange thing is that I can launch the script several times and got the error, and the second after (without changing anything) I launch it again and it works perfectly well. So the motors are connected and recognized by the computer.

Does someone have an idea about why I have this problem ? Thanks,

Caroline