Getting an Exception while using Xamarin.Forms.Labs.Charting

I'm using the following code for displaying the bar chart and Line chart in single chart

using System;
using Xamarin.Forms;
using Xamarin.Forms.Labs.Charting.Controls;

namespace BarChart
{
public class BarChartExample : ContentPage
{
public BarChartExample ()
{
Series firstBarSeries = new Series
{
Color = Color.Red,
Type = ChartType.Bar
};
firstBarSeries.Points.Add(new DataPoint() { Label = "Jan", Value = 25});
firstBarSeries.Points.Add(new DataPoint() { Label = "Feb", Value = 40});
firstBarSeries.Points.Add(new DataPoint() { Label = "March", Value = 45});

        Series secondBarSeries = new Series
        {
            Color = Color.Blue,
            Type = ChartType.Bar
        };
        secondBarSeries.Points.Add(new DataPoint() { Label = "Jan",   Value = 30 });
        secondBarSeries.Points.Add(new DataPoint() { Label = "Feb",   Value = 35 });
        secondBarSeries.Points.Add(new DataPoint() { Label = "March", Value = 40 });

        Series lineSeries = new Series
        {
            Color = Color.Green,
            Type = ChartType.Line
        };
        lineSeries.Points.Add(new DataPoint() { Label = "Jan",   Value = 27.5 });
        lineSeries.Points.Add(new DataPoint() { Label = "Feb",   Value = 37.5 });
        lineSeries.Points.Add(new DataPoint() { Label = "March", Value = 42.5 });

        Chart chart = new Chart()
        {
            Color = Color.White,
            WidthRequest = 450,
            HeightRequest = 750,
            Spacing = 10
        };
        chart.Series.Add(firstBarSeries);
        chart.Series.Add(secondBarSeries);
        chart.Series.Add(lineSeries);

        Content = chart;
    }
}

}

Getting the Exception : An exception was thrown by the type initializer for Xamarin.Forms.Labs.Charting.Controls.Series ---> System.MissingMethodException: Method 'BindableProperty.Create' not found.

I have added reference Xamarin.Forms.Labs.Charting in Droid Project.

and added new Xamarin.Forms.Labs.Charting.Droid.Controls.ChartRenderer (); in MainActivity.cs

Please correct me..