In rather uncommon situations, a teacher submitting an Assignment for a student may experience a "Call to undefined method assign::view_error_page()" exception. Additionally, notices produced within calls to assign::process_submit_other_for_grading(), assign::process_submit_for_grading(), and assign::submit_for_grading() are not propagated up for display to the user because $notices parameters to those functions are not defined as call-by-reference.

To reproduce:

1. Add an Assignment activity with 'Require students to click the submit button' set to Yes.
2. Edit the submission for a student, add a file. The submission should now have a Draft status.
3. In the grading table, from the Status action menu for the draft submission, open in a new tab with the 'Prevent submission changes' option.
4. Still on the grading table tab as in step 3, from the same submission's Status action menu, choose the 'Submit for grading' option.
5. Observe the exception: Exception - Call to undefined method assign::view_error_page()