Java Programming

Hi,

I am having some trouble regarding usage of Jung. Any help would be greatly appreciated!

For the following code, please assume that the Graph g is already created.

public void viewGraph(){
		Layout <Integer, String> layout = new CircleLayout(g);
		layout.setSize(new Dimension(350, 350));
		BasicVisualizationServer <Integer, String> myServer = new BasicVisualizationServer<Integer, String> (layout);
		myServer.setPreferredSize(new Dimension(300,300));
	
		JFrame frame = new JFrame ("Normal Graph");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		frame.getContentPane().add(myServer);
		frame.pack();
		frame.setVisible(true);
		
		System.err.println("Normal Graph drawn.");
	}

In the above code, the following line of code is not recognized in the IDE:

frame.getContentPane().add(myServer);

Could someone please tell me why this happens? I have all the necessary packages, etc imported.

Thanks!