C# Class NUnit.Extensions.Asp.AspTester.RepeaterTester.ContainerMustBeItemException

Exception: The container of the control being tested was a RepeaterTester, but it should be a RepeaterItemTester. Change "new MyTester("foo", repeater)" to "new MyTester("foo", repeater.Item(itemNum))". You may also use repeater.Header, repeater.Footer, or repeater.GetSeparator(separatorNum) as the container argument.