If you're attempting to perform your Master Rollover, and see a message stating:  'From School Year must precede the To School Year,' this means you've already switched your Current School Year over to next year.

To change your Current School Year:
  1. Navigate to Core.
  2. Select Core > Settings > School Information > Years & Terms.
  3. Select your previous school year (the one you want to rollover FROM).
  4. Click Edit.
  5. Set Current Year to Yes.
  6. Save.