TransportException: receive_once[/add_two_ints]: DeserializationError cannot deserialize

$ sudo apt-get install ros-kinetic-genpy

 

 ser.py

#!/usr/bin/env python

from __future__ import print_function

from rospy_tutorials.srv import *
import rospy

def handle_add_two_ints(req):
    print( req)
    return 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()

cli.py

#!/usr/bin/env python

from __future__ import print_function

import sys
import rospy
from rospy_tutorials.srv import *

def add_two