Can't find the custom message....ImportError: No module named wam_node.msg

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I have wasted my whole day figuring this thing out. I can rosrun both packages, but python just cant find that "wam_node" package. I have used c++ before to use the same message and it worked. I don't know what is wrong ? Am I missing something ?

Any help/suggestion is appreciated. Thanks in advance.

Error when I run the package (rosrun hand_control grasp_with_biotac.py):

Traceback (most recent call last):
  File "/home/rohit/catkin_ws/src/BMI-robot-arm-control/hand_control/src/grasp_with_biotac.py", line 12, in <module>
    from wam_node.msg import HandPosVel
ImportError: No module named wam_node.msg

Python code for import:

from std_msgs.msg import String
from biotac_sensors.msg import BioTacHand
from wam_node.msg import HandPosVel

"rosmsg list | grep Hand"output:

biotac_sensors/BioTacHand
wam_node/HandPos
wam_node/HandPosVel

manifest.xml of hand_control package :

<package>
  <description brief="hand_control">

     hand_control

  </description>
  <author>robot</author>
  <license>BSD</license>
  <review status="unreviewed" notes=""/>
  <url>http://ros.org/wiki/hand_control</url>
  <depend package="wam_node"/>
  <depend package="wam_msgs"/>
  <depend package="wam_srvs"/>
  <depend package="wam_control"/>

</package>