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What is is saying is that you cannot declare the package a catkin package, which is done with the catkin_package() instruction, before you call generate_messages(). In order to solve this error move your catkin_package() snippet to the very end of the file.

Read the error:

generate_messages() must be called before catkin_package() in project  beginner_tutorials

And this becomes clear. I hope this helps.

This is a duplicate of error when catkin_make install in tutorial about msg/srv

What is is saying is that you cannot declare the package a catkin package, which is done with the catkin_package() instruction, before you call generate_messages(). In order to solve this error move your catkin_package() snippet to the very end of the file.

Read the error:

generate_messages() must be called before catkin_package() in project  beginner_tutorials

And this becomes clear. I hope In order to prevent this helps.error in the future it is highly recommended to follow the instruction to create a catkin package and NOT reorder the components produced in the CMake file. The provided structure and comments/explanations in the auto generated CMakeLists.txt file are your best friend, even if it is overwhelming to start.

This is a duplicate of error when catkin_make install in tutorial about msg/srv