This error would indicate that a pupil who has been permanently excluded is still showing as a current student.
If the pupil should no longer be on roll please find the following guidance on how to off roll a pupil:
Alternatively if the wrong exclusion category has been entered this can be amended by going to the student profile (search the student name in the top right hand search bar). Once on the profile go to the conduct tab and click onto exclusions on the bottom left. Here you will have the option to edit the exclusion and update.