Periods() function giving error

[bradley-meldrum-fhr]

The UDF UI is giving me an error when I try to include a periods() function. I would like to have 2 inputs to my TestFunction() be the $window and $frequency (both defined as scalars). When I try to create the period condition using those inputs it says that "duration must have time units at 'periods'"

I can get it to work if I use .convertUnits('d') to tack on a unit of "days" but then when I try to use anything other than days in my inputs it gives me an error saying that the periods function requires an integer input. The conversion from my starting units to days usually results in a decimal number.