by AL Rachels.
Hi Judy,
Like Tim suggested, I think you placed the code in the wrong folder. Safe Exam Browser quiz access rule needs to be in a folder named safeexambrowser and it needs to be in: .. /yourmoodle/mod/quiz/accessrule
I deliberately just tested adding it to the mod folder on my experimental 2.3 site ..moodle23dev/web/mod folder and got the same debug info shown your previous post shows. The fix is to just delete it from where it is and place in the right spot, reload you web page and the install should then continue correctly.
HTH,
AL