I am trying to communicate with my Dynamixel Pro Motor. I have source installed the dynamixelprocontroller and dynamixelprodriver.

When I attempt to roslaunch, the execution errors out saying:

[ERROR] [1464744825.714234743]: No servos details loaded to param server
[FATAL] [1464744825.714310227]: BREAKPOINT HIT
    file = /home/rohit/trial2/src/dynamixel_pro_controller/src/dynamixel_pro_controller.cpp
    line=206

This is the line which is causing the error I think:

if (nh->hasParam("servos"))

I am not really sure how to solve this error. How exactly is my nodehandle supposed to get this parameter?

I'm not entering the whole code of dynamixelprocontroller.cpp as it's very long. Please follow the link.

Below is my launch file:

<launch>
 <node name="dynamixel_manager" pkg="dynamixel_pro_controller" type="dynamixel_pro_controller_node" required="true" output="screen">
        <rosparam>
            namespace: dynamixel_controller_manager
            serial_ports:
                dxl_tty1:
                    port_name: "/dev/ttyUSB0"
                    baud_rate: 1000000
                    min_motor_id: 0
                    max_motor_id: 30
                    update_rate: 10
        </rosparam>
  </node>
<launch>