Fatal error: Only variables can be passed by reference in

Hi Friends,

i want to develop quiz page with multiple question, But I faced a problem on first step.
i installed this module and when i click on "Take by Ajax", than a error coming on screen

"Fatal error: Only variables can be passed by reference in C:\xampp\htdocs\science\sites\all\modules\quiz\includes\ajax_quiz\ajax_quiz.admin.inc on line 55"

please provide any solution or advice for this issue.

Regards
Royal jat