Scheduling .sunday() jobs is only allowed for weekly jobs. Using .sunday() on a job scheduled to run every 2 or more weeks is not supported.

Raise code

)
        self.start_day = "saturday"
        return self.weeks

    @property
    def sunday(self):
        if self.interval != 1:
            raise IntervalError(
                "Scheduling .sunday() jobs is only allowed for weekly jobs. "
                "Using .sunday() on a job scheduled to run every 2 or more weeks "
                "is not supported."
            )
        self.start_day = "sunday"
        return self.weeks

    def tag(