bonjour j'ai un petit problème d'illégalArgumentException :

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import javax.swing.JCheckBox;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
 
 
public class AlphaListenerScrollPanel extends JScrollPane{
 
	JCheckBox[] _list;
 
 
	AlphaListenerScrollPanel(String[] list)
	{
		super();
 
		_list = new JCheckBox[list.length];
		for (int i = 0; i< list.length; i++)
		{
			JCheckBox jc = new JCheckBox(list[i],true);
			_list[i] = jc;
		}
		this.add(new AlphaPanel(_list));
	}
 
	private class AlphaPanel extends JPanel
	{
		AlphaPanel(JCheckBox[] list)
		{
			super();
			this.setLayout(null);
			int pos = 0;
			for (int i =0 ; i< list.length ; i++)
			{
				list[i].setBounds(0,pos , this.getWidth(), 20);
				this.add(list[i]);
				pos = pos + 20;
			}
		}
	}
 
	public String[] getSelectedString()
	{
		int count = 0;
		for (int i = 0 ; i< _list.length; i++)
		{
			if (_list[i].isSelected()) count++;
		}
		String[] selection = new String[count];
		count = 0;
		for (int i = 0 ; i< _list.length; i++)
		{
			if (_list[i].isSelected())
				{
					selection[count] = _list[i].getText();
					count++;
				}
		}
		return selection;
	}
}
et ma petit erreur :

Exception during event dispatch:
java.lang.IllegalArgumentException
at javax.swing.ScrollPaneLayout.addLayoutComponent(libgcj.so.7rh)
at java.awt.Container.addImpl(libgcj.so.7rh)
at java.awt.Container.add(libgcj.so.7rh)
at AlphaListenerScrollPanel.<init>(AlphaListenerScrollPanel.java:21)
at SelectionPanel.<init>(SelectionPanel.java:16)
at MainFrame$PushListener.actionPerformed(MainFrame.java:43)
at javax.swing.AbstractButton.fireActionPerformed(libgcj.so.7rh)
at javax.swing.AbstractButton$1.actionPerformed(libgcj.so.7rh)
at javax.swing.DefaultButtonModel.fireActionPerformed(libgcj.so.7rh)
at javax.swing.DefaultButtonModel.setPressed(libgcj.so.7rh)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(libgcj.so.7rh)
at java.awt.Component.processMouseEvent(libgcj.so.7rh)
at java.awt.Component.processEvent(libgcj.so.7rh)
at java.awt.Container.processEvent(libgcj.so.7rh)
at java.awt.Component.dispatchEventImpl(libgcj.so.7rh)
at java.awt.Container.dispatchEventImpl(libgcj.so.7rh)
at java.awt.Component.dispatchEvent(libgcj.so.7rh)
at java.awt.LightweightDispatcher.handleMouseEvent(libgcj.so.7rh)
at java.awt.LightweightDispatcher.dispatchEvent(libgcj.so.7rh)
at java.awt.Container.dispatchEventImpl(libgcj.so.7rh)
at java.awt.Window.dispatchEventImpl(libgcj.so.7rh)
at java.awt.Component.dispatchEvent(libgcj.so.7rh)
at java.awt.EventQueue.dispatchEvent(libgcj.so.7rh)
at java.awt.EventDispatchThread.run(libgcj.so.7rh)

ligne 21 ===> this.add(new AlphaPanel(_list));

une idée (un truc que j'ai surement mal fait ...)