Lesson 'Biology' for group '9A' has a pinned room but the room value is empty.
Last updated: Mar 23, 2026
At a glance
A lesson is set to use a pinned room but no room is assigned.
What causes this error
A lesson has been configured to be pinned to a specific room, but the room field is empty or null. This is an inconsistent state that the scheduler cannot process.
How to fix it
Go to the Lessons section, find this lesson, and either assign a valid room to the pin or remove the room pin entirely.
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