In one of my courses some of the students are "expired". When trying to extend their course i get the attached message. How do I resolve this?
This error occurs only in two cases:
1) When there is no student (whose subscription you want to extent) in the course.
2) When the student's time stamp is not set in the course.
It could be like you have imported the students in the course, so the time stamp is missing.
Quick fix for this issue is you remove the students from the course and again add them to the course.