Unable to get the forecast_ets property of the worksheetfunction class

I've been trying to call the Forecast.ETS function from VBA code with Application.WorksheetFunction, however I'm getting the "unable to get the forecast_ets property of the worksheetfunction class error."

Sub test()

Cells(20, 5) = Application.WorksheetFunction.Forecast_ETS(Cells(5, 3).Value, _
                                           Range(Cells(5, 3), Cells(20, 3)), _
                                           Range(Cells(5, 2), Cells(20, 2)).Value)

End Sub

Cells(5,3).Value is a date, same as Range(Cells(5,2),Cells(20,2)).Value

Range(Cells(5, 3), Cells(20, 3)) contains the historical values.