[Solved]Catkin_make msg and srv error

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Hello, everyone. I am following the tutorial here to set up msg and srv: link text

After I added all things to my tutorials file, I got this output

    CMake Error at /opt/ros/melodic/share/catkin/cmake/catkin_package.cmake:224 (message):
  catkin_package() DEPENDS on the catkin package 'message_runtime' which must
  therefore be listed as a run dependency in the package.xml
Call Stack (most recent call first):
  /opt/ros/melodic/share/catkin/cmake/catkin_package.cmake:102 (_catkin_package)
  beginner_tutorials/CMakeLists.txt:104 (catkin_package)


-- Configuring incomplete, errors occurred!
See also "/home/ros/catkin_ws/build/CMakeFiles/CMakeOutput.log".
See also "/home/ros/catkin_ws/build/CMakeFiles/CMakeError.log".
Makefile:712: recipe for target 'cmake_check_build_system' failed
make: *** [cmake_check_build_system] Error 1
Invoking "make cmake_check_build_system" failed

And I went to the CMakeLists.txt:104 to check what is wrong. Here's the code.

 catkin_package(
  INCLUDE_DIRS include
  LIBRARIES beginner_tutorials
  CATKIN_DEPENDS message_runtime roscpp rospy std_msgs
   DEPENDS system_lib
 )

There was a note for this code in the page of the tutorial, but I couldn't understand what I really should do for it.

In the tutorial, they said "Also make sure you export the message runtime dependency. "

catkin_package(
  ...
  CATKIN_DEPENDS message_runtime ...
  ...)

It was commented lines, so I uncommented them and then I got the error. So I also tried commenting out them, and I got an error too.

Thank you for any help!!

Here is the entire CMakeLists.txt

cmake_minimum_required(VERSION 3.0.2)
project(beginner_tutorials)

## Compile as C++11, supported in ROS Kinetic and newer
# add_compile_options(-std=c++11)

## Find catkin macros and libraries
## if COMPONENTS list like find_package(catkin REQUIRED COMPONENTS xyz)
## is used, also find other catkin packages
find_package(catkin REQUIRED COMPONENTS
  roscpp
  rospy
  std_msgs
  message_generation
)

## System dependencies are found with CMake's conventions
# find_package(Boost REQUIRED COMPONENTS system)


## Uncomment this if the package has a setup.py. This macro ensures
## modules and global scripts declared therein get installed
## See http://ros.org/doc/api/catkin/html/user_guide/setup_dot_py.html
# catkin_python_setup()

################################################
## Declare ROS messages, services and actions ##
################################################

## To declare and build messages, services or actions from within this
## package, follow these steps:
## * Let MSG_DEP_SET be the set of packages whose message types you use in
##   your messages/services/actions (e.g. std_msgs, actionlib_msgs, ...).
## * In the file package.xml:
##   * add a build_depend tag for "message_generation"
##   * add a build_depend and a exec_depend tag for each package in MSG_DEP_SET
##   * If MSG_DEP_SET isn't empty the following dependency has been pulled in
##     but can be declared for certainty nonetheless:
##     * add a exec_depend tag for "message_runtime"
## * In this file (CMakeLists.txt):
##   * add "message_generation" and every package in MSG_DEP_SET to
##     find_package(catkin REQUIRED COMPONENTS ...)
##   * add "message_runtime" and every package in MSG_DEP_SET to
##     catkin_package(CATKIN_DEPENDS ...)
##   * uncomment the add_*_files sections below as needed
##     and list every .msg/.srv/.action file to be processed
##   * uncomment the generate_messages entry below
##   * add every package in MSG_DEP_SET to generate_messages(DEPENDENCIES ...)

## Generate messages in the 'msg' folder
 add_message_files(
   FILES
   Num.msg
 )

## Generate services in the 'srv' folder
 add_service_files(
   FILES
   AddTwoInts.srv
 )

## Generate actions in the 'action' folder
# add_action_files(
#   FILES ...