Why catkin_make doesn't create executables?

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When I try to build the client-server C++ tutorial with catkin_make it doesn't create any executables, I think I have everything else in order. I had followed every single step in the previous tutorials, the worspace is correctly configured, the CMakeLists.txt seems in order as the package.xml.

Here is the link to the tutorial.http://wiki.ros.org/ROS/Tutorials/WritingServiceClient%28c%2B%2B%29

And the output when I try to build and then execute.

viki@c3po:~$ cd ~/catkin_ws/

viki@c3po:~/catkin_ws$ catkin_make

Base path: /home/viki/catkin_ws
Source space: /home/viki/catkin_ws/src
Build space: /home/viki/catkin_ws/build
Devel space: /home/viki/catkin_ws/devel
Install space: /home/viki/catkin_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/viki/catkin_ws/build"
####
####
#### Running command: "make -j1 -l1" in "/home/viki/catkin_ws/build"
####

viki@c3po:~$ rosrun beginner_tutorials add_two_ints_server

[rosrun] Couldn't find executable named add_two_ints_server below /home/viki/catkin_ws/src/beginner_tutorials
viki@c3po:~$