Revit API Cannot create swept blend form

Developers
,
1

I have a problem with creating NewSweptBlendForm, the issue prabably is with ReferenceArrayArray. I dont understand why cant I just pass CurveLoop, why it have to be a reference. The code looks like this:

//Some code before
FamilyInstance baseFamilyInstance = (FamilyInstance)keyValuePairs["BaseFamilyInstance"];
FamilyInstance negativeFamilyInstance = (FamilyInstance)keyValuePairs["NegativeFamilyInstance"];
ModelLine negBaseLine = CreateModelLine(negativeSectionPointArray, baseSectionPointArray);
using(Transaction transaction = new Transaction(document,"Create swept blend"))
            {
                transaction.Start();
                ReferenceArray lineReferenceArray = new ReferenceArray();
                lineReferenceArray.Append(negBaseLine.GeometryCurve.Reference);
                Options options = new Options();
                options.ComputeReferences = true;
                options.IncludeNonVisibleObjects = true;
                options.DetailLevel = ViewDetailLevel.Fine;
                CurveLoop baseCurve = CurveLoop.Create(baseFamilyInstance.get_Geometry(options).OfType<Curve>().ToList());
                CurveLoop negativeCurve = CurveLoop.Create(negativeFamilyInstance.get_Geometry(options).OfType<Curve>().ToList());
                ReferenceArray baseSectionReference = new ReferenceArray();
                ReferenceArray negativeSectionReference = new ReferenceArray();
                foreach(Curve c in baseCurve)
                {
                    baseSectionReference.Append(c.Reference);
                }
                foreach(Curve c in negativeCurve)
                {
                    negativeSectionReference.Append(c.Reference);
                }
                ReferenceArrayArray referenceArrayArray = new ReferenceArrayArray();
                referenceArrayArray.Append(baseSectionReference);
                referenceArrayArray.Append(negativeSectionReference);
                document.FamilyCreate.NewSweptBlendForm(true, lineReferenceArray, referenceArrayArray);
                transaction.Commit();
            }

I use this as node in dynamo, and the outpout is: cannot create swept bledn form. What am I doing wrong?