as a schedule manager, it should has a check when it try to remove a schedule
as a schedule manager, it should has a check when it try to remove a schedule

lightningkay/NoahGameFrame,lightningkay/NoahGameFrame,lightningkay/NoahGameFrame,lightningkay/NoahGameFrame,lightningkay/NoahGameFrame,lightningkay/NoahGameFrame,lightningkay/NoahGameFrame