I go to mark a particular assignment. That all works fine. Then I go to mark another assignment and I get this message. (clicking on the assignment results. I can't even get to the instruction page) I have talked to our tech moodle support and they can't seem to figure out what is wrong.
(They think it might be a coding error within moodle).
I have found a workaround which involves shutting down firefox and opening up a private firefox browser and clicking on the particular assignment works fine. But I would like to find out what we can do to fix this problem.
Moodle 2.8. Firefox 42.0
The full error message is here: