Error , 'Aras.IOM.Item' does not contain a constructor that takes 2 arguments

var selectedItemClass = new Item("Item Class", "get"); -Javascript
Error: Line number 18, Error Number: CS1729, 'Aras.IOM.Item' does not contain a constructor that takes 2 arguments

Item selectedItemClass = this.getInnovator().newItem("Item Class", "get"); - C#