Reflection.TargetInvocationException

I have a class named carroms. When I create its object, there is no error. But when I create an array of carroms then, this exception is thrown:

An unhandled exception of type 'System.Reflection.TargetInvocationException' occurred in PresentationFramework.dll

Additional information: Exception has been thrown by the target of an invocation.

My code for the carroms class:

class carroms
{

    private bool player;

    public bool checkPlayer
    {
        get { return player; }
        set { player = value; }
    }

    private Point center;

    public Point carromCenter
    {
        get { return center; }
        set { center = value; }
    }

    private Point[] points;

    public Point[] carromPoints
    {
        get { return points; }
        set { points = value; }
    }

    private double width;

    public double carromWidth
    {
        get { return width; }
        set { width = value;
        }
    }

    private double height;

    public double carromHeight
    {
        get { return height; }
        set { height = value; }
    }

    public carroms()
    {
        points = new Point[370];
    }

    public Ellipse draw()
    {
        Ellipse myellipse = new Ellipse();
        myellipse.Height = carromHeight;
        myellipse.Width = carromWidth;
        if (checkPlayer == true)
        {
            myellipse.Fill = Brushes.Black;
        }
        else
        {
            myellipse.Fill = Brushes.Beige;
        }
        return myellipse;
    }
}

And my code for creating the object:

Random randi = new Random();
carroms[] mycarroms = new carroms[5];
mycarroms[0].carromHeight = 100;
mycarroms[0].carromWidth = 100;
mycanvas.Children.Add(mycarroms[0].draw());