Error while launching roboclaw motor driver

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I have cloned the package from this url and executed catkin_make successfully. When i launched the driver with the command $ roslaunch roboclaw_node roboclaw.launch, i am getting the below error. How to fix this error?

Traceback (most recent call last):
  File "/home/kishore/catkin_ws/src/roboclaw_ros/roboclaw_node/nodes/roboclaw_node.py", line 6, in <module>
    import roboclaw_driver.roboclaw_driver as robocl

aw
ImportError: No module named roboclaw_driver.roboclaw_driver
[roboclaw_node-2] process has died [pid 9110, exit code 1, cmd /home/kishore/catkin_ws/src/roboclaw_ros/roboclaw_node/nodes/roboclaw_node.py __name:=roboclaw_node __log:=/home/kishore/.ros/log/8f624f98-6aa5-11e7-86c7-3c77e651e7b9/roboclaw_node-2.log].
log file: /home/kishore/.ros/log/8f624f98-6aa5-11e7-86c7-3c77e651e7b9/roboclaw_node-2*.log