This does NOT mean you need to delete your older planbooks. We've had an issue with multiple users sharing a single account, which is why we instituted a limit on the number of active planbooks per account.
Many of you legitimately need multiple planbooks - maybe you are a homeschool teacher with a planbook for each child. Maybe you teach at more than one school in your district, or more than one subject.
Again, you do NOT need to delete your older planbooks.
Please confirm that the planbooks in your account were created by you, and not by others. Once we hear from you at firstname.lastname@example.org, we will review your account and get back to you promptly.
Thank you for your understanding and patience.