At a glance

All subgroups in a division must have lessons assigned.

What causes this error

In a division, all subgroups must participate in the timetable. If some subgroups have lessons assigned but others do not, the schedule would be unbalanced and some students would have empty slots during division time.

How to fix it

Go to the Lessons section and add lessons for the subgroups that currently have none. Every subgroup within the same division must have at least one lesson assigned.

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