Autodesk.Revit.Creation.FamilyItemFactory.NewSweep()

Autodesk.Revit.Exceptions.InvalidOperationException
The attempted operation is not permitted in this type of family.

// sweepPath is a CurveByPoints instance.
if (null != sweepPath)
            {
                acTrans.Start("Cable");
                // create a circle as bottom shape for the cable
                IList<XYZ> points = sweepPath.GeometryCurve.Tessellate();
                XYZ center = points[0];
                Plane workingPlane = Plane.CreateByNormalAndOrigin(XYZ.BasisZ, center);
                Arc bottomShape = Arc.Create(workingPlane, _radius, 0, 2 * Math.PI);

                // create profile
                CurveArray curveArray = new CurveArray();
                curveArray.Append(bottomShape);
                CurveArrArray arrArray = new CurveArrArray();
                arrArray.Append(curveArray);
                SweepProfile profile = _rvApp.Create.NewCurveLoopsProfile(arrArray) as SweepProfile;

                // create path
                XYZ sweepPathDirection = points[1] - points[0];
                double angle = sweepPathDirection.AngleTo(XYZ.BasisZ);
                XYZ direction = sweepPathDirection.CrossProduct(XYZ.BasisZ);
                Line axis = Line.CreateUnbound(center, direction);
                ElementTransformUtils.RotateElement(familydoc, sweepPath.Id, axis, angle);
                CurveArray path = new CurveArray();
                path.Append(sweepPath.GeometryCurve);

                // create sketch plane
                Plane plane = Plane.CreateByNormalAndOrigin(new XYZ(10, 0, 0), refPointArray.get_Item(0).Position);
                SketchPlane pathPlane = SketchPlane.Create(familydoc, plane);

                // create the cable
                // Sweep sweep = familydoc.FamilyCreate.NewSweep(true, curveArray, pathPlane, profile, 0, ProfilePlaneLocation.Start);
                ReferenceArray refArray = new ReferenceArray();
                refArray.Append(sweepPath.GeometryCurve.Reference);
                Sweep sweep = familydoc.FamilyCreate.NewSweep(true, refArray, profile, 0, ProfilePlaneLocation.Start);
                acTrans.Commit();
            }