I see.
Actually, units build on the knowledge in previous units, so we don’t (and won’t) repeat information already covered in other units.
However, I’ll see how we can improve the gradebot messages.
By the way, the best way to avoid this problem is adding services_quiz_srv when creating services_quiz, like this:
cd ~/ros2_ws/src
ros2 pkg create services_quiz --dependencies rclcpp services_quiz_srv
This would automatically create the CMakeList.txt and package.xml entries.