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Because you should create your package in your src folder.
More simply, after you create your catkin workspace, (Let's say catkin_ws) go to your src folder
cd /home/$USER/catkin_ws/src
Then create your package
catkin_create_pkg using_markers roscpp visualization_msgs
after that you need to do catkin_make in your catkin_ws.
cd /home/$USER/catkin_ws
catkin_make
Then go to the devel and run the setup.bash
cd /home/$USER/catkin_ws/devel
. setup.bash