ros package not working.

[ruks001]

I tried to create ros package inside the packages folder. I created CMakeLists.txt, package.xml, src and code inside src as instructed in another instruction: https://docs.duckietown.com/daffy/devmanual-software/beginner/ros/create-project.html

But, when I try to run it in the bot using " dts devel run -R ROBOT_NAME -L my-subscriber" it throws an error saying that there is not package "my_package", where my_package is added in the packages folder. What could be the issue? Can you please guide?