Java : erreur execution Linux

import java.awt.*;
import javax.swing.*;
import javax.swing.JFrame;

public class Main {

 

        public static void main(String[] args){

		ConfigFenetre fen2 = new ConfigFenetre();    

        }

}

import java.awt.BorderLayout;

import java.awt.Color;

import java.awt.FlowLayout;

import java.awt.GridBagLayout;

import java.awt.GridLayout;

import java.awt.Panel;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

 

import javax.swing.AbstractButton;

import javax.swing.ButtonGroup;

import javax.swing.GroupLayout;

import javax.swing.JFrame;

import javax.swing.JLabel;

import javax.swing.JPanel;

import javax.swing.JRadioButton;

import javax.swing.BoxLayout;

import javax.swing.JButton;

 

public class ConfigFenetre extends JFrame implements ActionListener {

    

	        JPanel container1 = new JPanel();

		private JButton validation;

//constructeur	

        public ConfigFenetre(){

        

	        this.setTitle("Labyrinthe - settings");

	        this.setSize(270, 220);

		this.setResizable(false);

        	this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        	this.setLocationRelativeTo(null);

		this.setBackground(new Color(0,0,0,255));

		

		validation = new JButton("Let's started !");

		validation.addActionListener(this);

		validation.setVisible(true);

	// création des différents "parties" de notre fenetre de configuration

        	container1.setBackground(Color.black);

        	container1.setLayout(new BorderLayout());

// ajout des différents boutons et labels..	

		JPanel top3 = new JPanel(); 

		top3.add(validation);

	// ajout aux différents "blocs" les différentes zones

		container1.add(top3,BorderLayout.SOUTH);

		setContentPane(container1);

		this.setVisible(true);            

	}        

	public void actionPerformed(ActionEvent e) {

		if((JButton)e.getSource()==validation) {

			new TestFenetre().setVisible(true);

			this.setVisible(false);

		}

	}  

}

import javax.swing.*;

import java.awt.*;
import javax.swing.JFrame;



public class TestFenetre extends JFrame {

	public TestFenetre() {

		this.setTitle("ma nouvelle fenetre !!!");

		this.setSize(500,300);

		this.setBackground(new Color(0,120,120,155));

	}

}