Got error message upon submitting quiz?

I am using WordPress Quiz Master Next Plugin set up and it gives a certificate. When any user finishes the quiz it gives an error message is as below:

This is an error message

Warning:file_put_contents(wp-content/plugins/quiz-master-next/includes /certificates/mlw_qmn_quiz2015033009251099.php): failed to open stream: No such file or directory in /home/palmerho/public_html/wp-content/plugins/quiz-master-next/include s/mlw_quiz.php on line 1066

Well the error indicates that PHP cannot access the certificate, as in it does not exist in the given path. How does this relate to Grav though?

This is the Grav forum. Your question is concerning WordPress, another CMS altogether.

Just FYI, as Grav is so much better than WordPress, you would never see an error like this if you used Grav instead :)