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This was the error message received
I've encountered the same problem this morning. After reading Natasha's post, now I'm not certain whether my son tried to remove it or something happened by itself. I tried to reinstall following instructions provided by online chat but failed. I will try it again once my son return from his school this afternoon. Btw did you have any luck of reinstalling the app again on your daughter's MacBook?
I have outlined instructions below that will fix the issue you are having with your son's MacBook.
If you are having any issues with these steps, please don't hesitate to contact us and our support staff would be happy to help.
Customer Service Representative