I'm having trouble with skPolyline --- ALREADY ANSWERED...

I am having trouble with this code:

   var fPoints is array = [];
        var L = 10.0;
        var CL = L;
        var Rule = 1.0 ;
        for (var i = 0; i < definition.numberOfF; i += 1)
        {
            fPoints = append(fPoints,vector(0,CL*inch));
            CL = CL/Rule;
        }
        
        skPolyline(sketch1, "polyline1", {
                    "points" : fPoints
                });

I'm getting "Precondition of skPolyline failed (is2dPointVector(value.points))" in the error window.
Can you see the problem? I suspect I need to declare a vector array, but I don't know how to do that.