I'm using Ubuntu 12.04 & ROS Hydro. While going through this tutorial [here](http://wiki.ros.org/ROS/Tutorials/WritingPublisherSubscriber%28c%2B%2B%29) i encountered the following error upon typing:
`catkin_make`
asaad@VAIO:~/catkin_ws$ catkin_make
Base path: /home/asaad/catkin_ws
Source space: /home/asaad/catkin_ws/src
Build space: /home/asaad/catkin_ws/build
Devel space: /home/asaad/catkin_ws/devel
Install space: /home/asaad/catkin_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/asaad/catkin_ws/build"
####
####
#### Running command: "make -j4 -l4" in "/home/asaad/catkin_ws/build"
####
[ 0%] [ 8%] Built target std_msgs_generate_messages_py
[ 16%] [ 16%] Built target std_msgs_generate_messages_cpp
Building CXX object begginer_tutorials/CMakeFiles/add_two_ints_server.dir/src/add_two_ints_server.cpp.o
Building CXX object begginer_tutorials/CMakeFiles/add_two_ints_client.dir/src/add_two_ints_client.cpp.o
[ 16%] Built target std_msgs_generate_messages_lisp
[ 25%] Built target listener
[ 33%] Built target talker
[ 50%] Built target begginer_tutorials_generate_messages_cpp
[ 83%] Built target begginer_tutorials_generate_messages_py
[100%] Built target begginer_tutorials_generate_messages_lisp
[100%] Built target begginer_tutorials_generate_messages
/home/asaad/catkin_ws/src/begginer_tutorials/src/add_two_ints_server.cpp:2:43: fatal error: beginner_tutorials/AddTwoInts.h: No such file or directory
compilation terminated.
/home/asaad/catkin_ws/src/begginer_tutorials/src/add_two_ints_client.cpp:2:43: fatal error: beginner_tutorials/AddTwoInts.h: No such file or directory
compilation terminated.
make[2]: *** [begginer_tutorials/CMakeFiles/add_two_ints_server.dir/src/add_two_ints_server.cpp.o] Error 1
make[1]: *** [begginer_tutorials/CMakeFiles/add_two_ints_server.dir/all] Error 2
make[1]: *** Waiting for unfinished jobs....
make[2]: *** [begginer_tutorials/CMakeFiles/add_two_ints_client.dir/src/add_two_ints_client.cpp.o] Error 1
make[1]: *** [begginer_tutorials/CMakeFiles/add_two_ints_client.dir/all] Error 2
make: *** [all] Error 2
Invoking "make" failed
I saw the other answers related to this but couldn't find the error myself.
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