Variables
Const NoScheduleForSundayError
NoScheduleForSundayError: (Anonymous class) = makeErrorSubclass('no schedule exists for Sunday')
Const NoScheduleIsSetError
NoScheduleIsSetError: (Anonymous class) = makeErrorSubclass('no schedule is set for this week')
Const NotEnoughSubjectsError
NotEnoughSubjectsError: (Anonymous class) = makeErrorSubclass('there are not enough subjects ' +'registered in the database')