There may be times when there is a problem viewing a peers assignment. It may be because:
The document uploaded is blank
The document uploaded can't be opened
The student uploaded the wrong assignment
The document uploaded was in a language that the evaluator can't understand
In this case, you can mark the submission as problematic. This is done by clicking the 'warning' icon next to the "download" button. You will be asked to give a short explanation of what is the problem.
When you mark a submission as problematic you will be assigned a new submission to give feedback to instead of the original one.
If 3 students individually mark the same submission as problematic, then that submission will be taken out of circulation for the rest of the peer grading process and the teacher will be notified.