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Solved it. Problem is because of a package utilized by ros2 python packages -> setuptools

Solution

python version 3.8
setup tools version 58.2.0 ( last version to work with ros2 python packages without any warnings)

1 - find out your setup tools version

In terminal start python

image description

if it is above 58.2.0 then down grade it

pip install setuptools==58.2.0 ( all above versions do not work )

now colcon build it .

2 - Make sure you have underscores in setup.cfg file and not the '-' .

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