Sometimes it may happen that you defined more lessons per week for one teacher/room or class than you actually have positions per week.
This can be either a mistake in input, or misunderstanding of how the software interprets your input.
For example, this teacher has to teach 5 periods per week in 10 different classes. In total that is 50 lessons per week. However there are just 5 days each 7 periods. It is clearly not possible to teacher 50 periods per week. Either raise the amount of periods per day or change the contract of this teacher:
Do not forget to check the timeoff - teacher can have 10 periods, but only 5 free slots per week:
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