This might happen if you have a lot of books on your shelf. We are working to fix it. For now, try refreshing your page (the refresh button for most browsers is a small half circle button near where the website address in your browser is. ) If that doesn’t work, try logging out and logging back in. Wait 4-5 seconds to see if your books finish loading. If this error persists, send us a note through this Feedback form. Be sure to include your username and a parent email or teacher name so we can get in touch with you.