Creating a ROS msg and srv - Tutorial

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Hi!

I have the same problem as mentioned here: Error using rosmsg in "Creating msg and srv" Tutorial

In section 2.2 of this tutorial when typing the command

$ rosmsg show beginner_tutorials/Num

I don't get

init64 num

but

Unable to load msg [beginner_tutorials/Num]: Cannot locate message [Num]: unknown package [beginner_tutorials] on search path ...

In the other thread the solution is: I should simply run:

$ cd ~/catkin_ws/ then $ catkin_make

But there I get the Error:

CMake Error at /home/user/catkin_ws/build/beginner_tutorials/cmake/beginner_tutorials-genmsg.cmake:3 (message):
Could not find messages which '/home/user/catkin_ws/src/beginner_tutorials/msg/Num.msg' depends on.
Did you forget to specify generate_messages(DEPENDENCIES ...)?

Cannot locate message [init64] in package [beginner_tutorials] with paths
[['/home/user/catkin_ws/src/beginner_tutorials/msg']] Call Stack (most recent call first): /opt/ros/indigo/share/genmsg/cmake/genmsg-extras.cmake:304 (include)
beginner_tutorials/CMakeLists.txt:68 (generate_messages)

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

What do I do wrong. I changed the CMakeList.txt exactly as said in the tutorials and checked it a lot of times. And I put in

catkin_package(CATKIN_DEPENDS message_runtime)

Can anybody help me out here? Thanks!!

Edit:

Here is the CMakeLists.txt (I removed the commented parts):

cmake_minimum_required(VERSION 2.8.3)
project(beginner_tutorials)
find_package(catkin REQUIRED COMPONENTS
  roscpp
  rospy
  std_msgs
  message_generation
)
add_message_files(
   FILES
   Num.msg
)
generate_messages(
   DEPENDENCIES 
   std_msgs
)
include_directories(
  ${catkin_INCLUDE_DIRS}
)

And here the package.xml:

<?xml version="1.0"?>
<package>
  <name>beginner_tutorials</name>
  <version>0.0.0</version>
  <description>The package for beginners</description>


  <maintainer email="user@todo.todo">user</maintainer>

  <license>TODO</license>


  <build_depend>message_generation</build_depend>

  <run_depend>message_runtime</run_depend>

  <buildtool_depend>catkin</buildtool_depend>
  <build_depend>roscpp</build_depend>
  <build_depend>rospy</build_depend>
  <build_depend>std_msgs</build_depend>
  <run_depend>roscpp</run_depend>
  <run_depend>rospy</run_depend>
  <run_depend>std_msgs</run_depend>

  <export>

  </export>
</package>