Dear Support Team,
I have one quiz have more than one questions , one of them question need Require Grading when click over the linke of require grading and put the mark give me the below error :
A required parameter (attempt) was missing
That problem does not happen here: https://qa.moodledemo.net/mod/quiz/report.php?id=30&mode=overview, so I wonder why it is happening on your site?