This error will appear when a set of scans of one student is missing a page.
- Sign in to Ans.
- Click Scan in the menu on the left and select the course.
- Click Unknown at the right side of the bar of the assignment. The issue can be solved by either uploading the missing page or by adding an empty page with the right code to fill the sequence. The last option can be selected by clicking Fill with empty page.
- When you have fixed the upload errors, you can start reviewing the exams.