CMYKColor does not have a constructor

Afternoon all,

Simply want to create a CMYK Color (I don't think we can do LAB).

I tried:

var this         = new CMYKColor;

var really      = new CMYKColor();

var annoys   = new CMYKColor(1,2,3,4);

var me          = new CMYKColor(1,2,3,4,5);

All failed with the same message: "CMYKColor does not have a constructor".

Could someone please confirm this works on their computer and their versions?

Reference: InDesign CC 2015.4, ExtendScript 4.5.5

Cheers,

Antoine