At a glance

A lesson is set to use a pinned teacher but no teacher is assigned.

What causes this error

A lesson has the "pin teacher" flag set, but the teacher field is empty. The lesson is marked as pinned to a teacher but there is nothing to pin it to.

The most common scenario is regenerating/evaluating a timetable after teachers were modified. If a teacher was removed or their name changed after the previous generation, the pin may have been left behind without a valid teacher reference.

How to fix it

Open the timetable editor, find the lesson, and either:

• Assign a valid teacher to complete the pin, or
• Unpin it so the scheduler can assign a teacher automatically.

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