Did you remember to call setType() for 'advancedgradinginstanceid'? Defaulting to PARAM_RAW cleaning.

line 1303 of /lib/formslib.php: call to debugging()
line 281 of /lib/formslib.php: call to moodleform->detectMissingSetType()
line 202 of /lib/formslib.php: call to moodleform->_process_submission()
line 2725 of /mod/assign/locallib.php: call to moodleform->moodleform()
line 470 of /mod/assign/locallib.php: call to assign->view_single_grade_page()
line 53 of /mod/assign/view.php: call to assign->view()