I submitted the quiz. Even though I succeeded in the requested tasks I scored 1/4 out of the total points. I suspect that it’s because I used classes in coding my solution, and maybe the grading system did not expect it? Because I should’ve been getting all the points.
I think your problem might be related with the compilation method since the automatic corrector uses catkin_make. Could you try to remove your build and devel folders and recompile everything with catkin_make before submitting the Quiz again?
Also, make sure that you have the topics_quiz.launch launch file inside the topics_quiz package as requested in the Specifications of the Quiz.