Timer and TimerTask

[AndrewM16921]

I'm trying to use a Timer and a TimerTask that starts when a key is pressed, then stops when it is released. I'm not sure why I'm getting this error:

Exception in thread "AWT-EventQueue-1" java.lang.IllegalStateException: Task already scheduled or cancelled

I would think that it is started, then cancelled, started, cancelled, etc. Given this, how can I get this exception? Here are the relevant code fragments:

	public Timer timer = new Timer();
	public TimerTask
		LUp = new TimerTask()
		{
			public void run()
			{
				if(LY > 35)
				{
				LY-=10;
				}
			}
		},
		LDown = new TimerTask()
		{
			public void run()
			{
				if(LY < 365)
				{
				LY+=10;
				}
			}
		},
		RUp = new TimerTask()
		{
			public void run()
			{
				if(RY > 35)
				{
				RY-=10;
				}
			}
		},
		RDown = new TimerTask()
		{
			public void run()
			{
				if(RY < 365)
				{
				RY+=10;
				}
			}
		};

...

	public void keyPressed(KeyEvent e)
	{
		switch (e.getKeyCode())
		{
		case KeyEvent.VK_W:
			timer.scheduleAtFixedRate(LUp, 0, 30);
			break;
		case KeyEvent.VK_S:
			timer.scheduleAtFixedRate(LDown, 0, 30);
			break;
		}

		switch (e.getKeyCode())
		{
		case KeyEvent.VK_UP:
			timer.scheduleAtFixedRate(RUp, 0, 30);
			break;
		case KeyEvent.VK_DOWN:
			timer.scheduleAtFixedRate(RDown, 0, 30);
			break;	
		}
	}

	public void keyReleased(KeyEvent e)
	{
		switch (e.getKeyCode())
		{
		case KeyEvent.VK_W:
			LUp.cancel();
			break;
		case KeyEvent.VK_S:
			LDown.cancel();
			break;
		}

		switch (e.getKeyCode())
		{
		case KeyEvent.VK_UP:
			RUp.cancel();
			break;
		case KeyEvent.VK_DOWN:
			RDown.cancel();
			break;	
		}
	}

[Fubarable]

Is this a Swing application?

[AndrewM16921]

No, I'm doing it in an applet.