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At the step 2.1 how can I know if these two lines are uncommented ? Do I have to open the package.xml file with the editor as I did with the CMakeLists.txt?

Yes, you have to open the xml file using any text editor and uncomment those lines. Usually for xml files, comments are between <!-- and -->. So, just make sure that is not the case.

After I finish editing the CMakeLists.txt file, do I have to save it with the same name?

Yes, that is necessary as it enables you to run catkin_make correctly (without errors).

At the step 2.1 how can I know if these two lines are uncommented ? Do I have to open the package.xml file with the editor as I did with the CMakeLists.txt?

Yes, you have to open the xml file using any text editor and uncomment those lines. Usually for xml files, comments are between <!-- and -->. So, just make sure that is not the case.

After I finish editing the CMakeLists.txt file, do I have to save it with the same name?

Yes, that is necessary as it enables you to run catkin_make correctly (without errors).

Unable to load msg [beginner_tutorials/Num]: Cannot locate message [unit8] in package [beginner_tutorials] with paths [['/home/spyros/catkin_ws/src/beginner_tutorials/msg', '/home/spyros/catkin_ws/devel/share/beginner_tutorials/msg']]

This error can be solved by correcting unit8 to uint8.