add_service_files does not exist. Message: message file not found

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I have been trying out the tutorials in wiki.ros.org. I am facing problem in one of the tutorials in which I need to write a publisher and subscriber model in python. To build the nodes, when I tried catkin_make, I am having the below listed error

lucifer@LuciferMorningstar:~/catkin_ws$ catkin_make
Base path: /home/lucifer/catkin_ws
Source space: /home/lucifer/catkin_ws/src
Build space: /home/lucifer/catkin_ws/build
Devel space: /home/lucifer/catkin_ws/devel
Install space: /home/lucifer/catkin_ws/install
####
#### Running command: "make cmake_check_build_system" in "/home/lucifer/catkin_ws/build"
####
-- Using CATKIN_DEVEL_PREFIX: /home/lucifer/catkin_ws/devel
-- Using CMAKE_PREFIX_PATH: /home/lucifer/catkin_ws/devel;/home/lucifer/ws_moveit/devel;/opt/ros/melodic
-- This workspace overlays: /home/lucifer/catkin_ws/devel;/home/lucifer/ws_moveit/devel;/opt/ros/melodic
-- Found PythonInterp: /usr/bin/python2 (found suitable version "2.7.17", minimum required is "2") 
-- Using PYTHON_EXECUTABLE: /usr/bin/python2
-- Using Debian Python package layout
-- Using empy: /usr/bin/empy
-- Using CATKIN_ENABLE_TESTING: ON
-- Call enable_testing()
-- Using CATKIN_TEST_RESULTS_DIR: /home/lucifer/catkin_ws/build/test_results
-- Found gtest sources under '/usr/src/googletest': gtests will be built
-- Found gmock sources under '/usr/src/googletest': gmock will be built
-- Found PythonInterp: /usr/bin/python2 (found version "2.7.17") 
-- Using Python nosetests: /usr/bin/nosetests-2.7
-- catkin 0.7.20
-- BUILD_SHARED_LIBS is on
-- BUILD_SHARED_LIBS is on
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- ~~  traversing 3 packages in topological order:
-- ~~  - panda_moveit_config
-- ~~  - beginner_tutorials
-- ~~  - moveit_tutorials
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-- +++ processing catkin package: 'panda_moveit_config'
-- ==> add_subdirectory(panda_moveit_config)
-- +++ processing catkin package: 'beginner_tutorials'
-- ==> add_subdirectory(beginner_tutorials)
-- Using these message generators: gencpp;geneus;genlisp;gennodejs;genpy
----------
**CMake Error at /opt/ros/melodic/share/catkin/cmake/assert.cmake:20 (message):**

  **Assertion failed: file
  '/home/lucifer/catkin_ws/src/beginner_tutorials/msg/add_service_files' does
  not exist.  Message: message file not found**

Call Stack (most recent call first):
  /opt/ros/melodic/share/genmsg/cmake/genmsg-extras.cmake:113 (assert_file_exists)
  beginner_tutorials/CMakeLists.txt:51 (add_message_files)

-- Configuring incomplete, errors occurred!
See also "/home/lucifer/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/lucifer/catkin_ws/build/CMakeFiles/CMakeError.log".
Makefile:530: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed