ImportError: No module named my_tutorials.srv [closed]

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Hi,

I am trying to learn ROS service and client feature following the tutorial here and here. After following the instructions given in those tutorials, I did catkin_make and then source devel/setup.bash and no error message were thrown. To check if the service is in ROS workspace I also performed rossrv show AddTwoInts.srv and found the following,

[my_tutorials/AddTwoInts]:
int64 a
int64 b
 ---
int64 sum

[rospy_tutorials/AddTwoInts]:
int64 a
int64 b
---
int64 sum

But after that when I run the server node by doing rosrun my_tutorials add_two_ints_server.py, I get the following error ImportError: No module named my_tutorials.srv. I am not able to figure out the reason of getting this error. Any help to solve the problem is appreciated. For your reference, the catkin workspace can be found here.

Update

The add_two_ints_server.py is below.

#!/usr/bin/env python
from my_tutorials.srv import AddTwoInts,AddTwoIntsResponse
import rospy

def handle_add_two_ints(req):
  print "Returning [%s + %s = %s]"%(req.a, req.b, (req.a + req.b))
  return AddTwoIntsResponse(req.a + req.b)

def add_two_ints_server():
  rospy.init_node('add_two_ints_server')
  s = rospy.Service('add_two_ints', AddTwoInts, handle_add_two_ints)
  print "Ready to add two ints."
  rospy.spin()

if __name__ == "__main__":
  add_two_ints_server()