Hi doesnt anyone knows why my code in creating circular pattern doesnt work?

below is my code:

            swModel.Extension.SelectByID2("Sketch1", "SKETCH", 0, 0, 0, false, 0, null, 0);
            swModel.EditSketch();
            swModel.Extension.SelectByID2("Arc3", "SKETCHSEGMENT", 0, 0, 0, false, 0, null, 0);

            double arcRad = (bcd / 2.0) / 1000.0;
            double arcAngle = Math.Abs(((270.0 - angle) * Math.PI) / 180);     
            double patternSpacing = Math.Abs(((360.0 / holeNum) * Math.PI) / 180);

            //creates the pattern

            swModel.SketchManager.EditCircularSketchStepAndRepeat(arcRad, arcAngle, flangeDim.BoltCount, patternSpacing, true, "", false, false, true, "Arc3_");  

Thank you very much.