This runtime error can occur when the class used to create the class page in NetCommunity, has had the class, or class session, deleted in The Education Edge. This can result in the teacher being unable to edit or delete the class page, and a possible error when clicking on the class page link.

Typically, the class page will not show for students. So, the class page doesn't have to be deleted from the teacher view. 

If the class page links need to be deleted, contact support with the following information:   
Affected teacher username(s).
Affected page URL.
The exact steps to duplicate the issue (click by click).