add_message_files() directory not found

edit

I recently installed ROS indigo and following the tutorial to get to know ROS. However, error occurred after catkin_make. I have also included the log files. Please help me out let me know how to fix this!! Appreciate it!!

The error:

Base path: /home/ciara/catkin_ws
Source space: /home/ciara/catkin_ws/src
Build space: /home/ciara/catkin_ws/build
Devel space: /home/ciara/catkin_ws/devel
Install space: /home/ciara/catkin_ws/install

####
#### Running command: "make cmake_check_build_system" in "/home/ciara/catkin_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/ciara/catkin_ws/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/indigo
-- This workspace overlays: /opt/ros/indigo
-- Using PYTHON_EXECUTABLE: /usr/bin/python
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/ciara/catkin_ws/build/test_results
-- Found gtest sources under '/usr/src/gtest': gtests will be built
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.6.18
-- BUILD_SHARED_LIBS is on
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~  traversing 1 packages in topological order:
-- ~~  - beginner_tutorials
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'beginner_tutorials'
-- ==> add_subdirectory(beginner_tutorials)
-- Using these message generators: gencpp;genlisp;genpy
CMake Error at /opt/ros/indigo/share/genmsg/cmake/genmsg-extras.cmake:94 (message):
  add_message_files() directory not found:
  /home/ciara/catkin_ws/src/beginner_tutorials/msg
Call Stack (most recent call first):
  beginner_tutorials/CMakeLists.txt:13 (add_message_files)

-- Configuring incomplete, errors occurred!
See also "/home/ciara/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ciara/catkin_ws/build/CMakeFiles/CMakeError.log".
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed
Base path: /home/ciara/catkin_ws
Source space: /home/ciara/catkin_ws/src
Build space: /home/ciara/catkin_ws/build
Devel space: /home/ciara/catkin_ws/devel
Install space: /home/ciara/catkin_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/ciara/catkin_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/ciara/catkin_ws/devel
-- Using CMAKE_PREFIX_PATH: /opt/ros/indigo
-- This workspace overlays: /opt/ros/indigo
-- Using PYTHON_EXECUTABLE: /usr/bin/python
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/ciara/catkin_ws/build/test_results
-- Found gtest sources under '/usr/src/gtest': gtests will be built
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.6.18
-- BUILD_SHARED_LIBS is on
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~  traversing 1 packages in topological order:
-- ~~  - beginner_tutorials
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'beginner_tutorials'
-- ==> add_subdirectory(beginner_tutorials)
-- Using these message generators: gencpp;genlisp;genpy
CMake Error at /opt/ros/indigo/share/genmsg/cmake/genmsg-extras.cmake:94 (message):
  add_message_files() directory not found:
  /home/ciara/catkin_ws/src/beginner_tutorials/msg
Call Stack (most recent call first):
  beginner_tutorials/CMakeLists.txt:13 (add_message_files)

-- Configuring incomplete, errors occurred!
See also "/home/ciara/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ciara/catkin_ws/build/CMakeFiles/CMakeError.log".
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

My CMakelists.txt:

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 with any dependencies listed here
 generate_messages(
   DEPENDENCIES
   std_msgs
 )

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 ...