No motors found! [closed]

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I am not able to overcome this error for sometime now. There are similar questions but none of them have been able to solve my problem of "No motors found". Here's the error message that ROS gives when I launch the controller_manager.launch file.

PARAMETERS
 * /dynamixel_manager/namespace: dxl_manager
 * /dynamixel_manager/serial_ports/pan_tilt_port/baud_rate: 1000000
 * /dynamixel_manager/serial_ports/pan_tilt_port/max_motor_id: 8
 * /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: 1.11.13

NODES
  /
    dynamixel_manager (dynamixel_controllers/controller_manager.py)

ROS_MASTER_URI=http://localhost:11311

core service [/rosout] found
process[dynamixel_manager-1]: started with pid [5276]
[INFO] [WallTime: 1438486858.620549] pan_tilt_port: Pinging motor IDs 1 through 8...
[FATAL] [WallTime: 1438486859.290363] pan_tilt_port: No motors found.
================================================================================REQUIRED process [dynamixel_manager-1] has died!
process has died [pid 5276, exit code 1, cmd /home/ankit/catkin_ws/src/dynamixe

I followed dynamixel_controllers/Tutorials/ConnectingToDynamixelBus tutorial to create the package and the launch file. I have also setup my motor IDs using the Dynamanager software by Trossen Robotics. I've set the baudrate to 1000000 as recommended.

The interesting thing is that I can see my motors when I use arbotix_python (arbotix_driver & arbotix_terminal) nodes with the ls command. Please can anybody help ?