This may occur when a teacher's classes are not set up properly in NetClassroom. If the students are part of these courses their student page may not load properly and they may get the above error. The below steps will correct this.
  1. Check for any special characters in the assignments and catagories in FA web. If special characters are present remove them.  If issue persists continue to step two
  2. Delete the categories and assignments from the affected sections
  3. Re-enter the assignments and categories from these sections
  4. Attempt to log in to Blackbaud Netcommunity as a parent or student and view the students class page to verify information now loads correctly