At a glance

A lesson references a class group that no longer exists.

What causes this error

We've found that a lesson is assigned to a class that no longer exists in your list. This typically happens if a class was deleted or renamed after the lesson was initially set up.

How to fix it

1. Restore the class — Go to the Classes section and re-add the missing class with its original name.
2. Update the lesson — Alternatively, go to the Lessons section, find the affected lesson, and assign it to an existing class.

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