At early stages of timetable generation it is advised to try to generate draft. Draft is timetable without any constraints. This is very usefull, because it makes no sense to generate complete timetable with all the inputted constraints if there is some basic problem in the input.
You can either remove the constraints, or use a feature called Draft:
After selecing "Draft" generation, you can specify which constraints you want to turn off, and which shoudl be active with strict or relaxed generation.
Then press "Generate" and a timetable will be generated with the constraints you allowed.
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