At a glance

A lesson's planned day or time no longer exists in the current school period configuration.

What causes this error

A lesson in this timetable is scheduled at a day/time that no longer exists in the current school period configuration. This typically happens when the school periods were modified after the timetable was last generated/evaluated — the timetable's period data and the current school data are now out of sync.

How to fix it

There are two directions you can take:

Adapt the timetable to match the current school configuration:

• Open the timetable and update its period configuration to match the current school periods. This realigns the timetable's time grid with the current data so generation/evaluation can proceed.

Adapt the school configuration to match the timetable:

• Go to School Config → Periods and restore the period configuration that was in place when the timetable was generated, so the timetable's scheduled times become valid again.

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