CMake Error - WritingPublisherSubscriber(c++)

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Hello everyone,

I'm new to ROS and browsing ROS tutorials I'm stuck with the problem in Writing a Simple Publisher and Subs.. tutorial.

Basically I followed it till the end and finally when I want to execute the catkin_make in catkin_ws $ I get an error message

CMake Error at /opt/ros/kinetic/share/genmsg/cmake/genmsg-extras.cmake:94 (message):
  add_message_files() directory not found:
  /home/hyuu/catkin_ws/src/beginner_tutorials/msg
Call Stack (most recent call first):
  beginner_tutorials/CMakeLists.txt:8 (add_message_files)

This is how my CMakeLists.txt inside beginner_tutorials folder looks like(copy-paste from tutorials):

cmake_minimum_required(VERSION 2.8.3)
project(beginner_tutorials)

## Find catkin and any catkin packages
find_package(catkin REQUIRED COMPONENTS roscpp rospy std_msgs genmsg)

## Declare ROS messages and services
add_message_files(DIRECTORY msg FILES Num.msg)
add_service_files(DIRECTORY srv FILES AddTwoInts.srv)

## Generate added messages and services
generate_messages(DEPENDENCIES std_msgs)

## Declare a catkin package
catkin_package()

include_directories(include ${catkin_INCLUDE_DIRS})

add_executable(talker src/talker.cpp)
target_link_libraries(talker ${catkin_LIBRARIES})
add_dependencies(talker beginner_tutorials_generate_messages_cpp)

add_executable(listener src/listener.cpp)
target_link_libraries(listener ${catkin_LIBRARIES})
add_dependencies(listener beginner_tutorials_generate_messages_cpp)

Thanks for any help provided!