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It looks like you have not sourced the ROS2 SDK before building your new workspace: https://index.ros.org/doc/ros2/Tutorials/Colcon-Tutorial/#source-an-underlay

cd <path_to_ros2_ws>
source install/setup.sh

For the following errors, I think that you may have mixed different versions of SDK and examples repositories. Ensure that both of them are up to date to the distribution that you are using (Dashing).