getting error in GraphViewSeries

[engr-erum]

i m using eclipse have made prj in eclipse and have added jar file as lib but still i m getting error GraphViewSeries in this class when trying to use this code

GraphViewSeries exampleSeries = new GraphViewSeries(new GraphViewData[] { new GraphViewData(1, 2.0d) , new GraphViewData(2, 1.5d) , new GraphViewData(3, 2.5d) , new GraphViewData(4, 1.0d) });