Teens not able to be in high school and an after school activity

My sim is in high school, the aspiration says to join an after school activity.  As soon as i click the activity it asks if sure the sim should quit high school to be in the activity.  If yes is selected then the sim will be disenrolled from school to enroll in the after school activity.  Aspiration can not be completed.  The option to go back to high school is in the jobs panel for part time job.