At a glance

Define the school's time periods (bell schedule) before generating.

What causes this error

To build a timetable, we need a bell schedule that defines when lessons can take place. Currently, no time periods have been configured in your settings.

How to fix it

Go to School Config → Periods and add at least two periods (for example, 08:00–08:45 and 08:50–09:35). Make sure each period has a start time and a duration.

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