Class '6A': the configured start or end time no longer matches any defined school period (value -1, valid range: 0–5, i.e. 08:00 – 08:50 – 12:50 – 13:40).

Last updated: Mar 23, 2026

At a glance

The class start/end time doesn't match any school period — usually caused by changing periods after configuring classes.

What causes this error

This error occurs when a class's Starting hour, Ending hour, or Max. starting hour no longer corresponds to any period in the school's time grid.

The most common cause: you configured the class times first, then changed (added or removed) school periods — now the class times reference a period that no longer exists.

How to fix it

There are two directions you can take:

Adapt the class configuration to match the current school periods:

  1. Go to Classes and edit the affected class.
  2. Update the Starting hour, Ending hour, and Max. starting hour to values within the valid range shown in the error.

Adapt the school periods to match the class configuration:

  1. Go to School Config → Periods and restore the period that was removed, so the class's configured time values become valid again.
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