Java JList error problem

package test;

import javax.swing.*;
import javax.swing.JOptionPane;
import java.awt.*;
import java.awt.event.*;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;

public class Main {
public static void main(String[] args) {
fr gui = new fr();
gui.go();

}
}

class fr{

JList list;

public void go(){
JFrame frame = new JFrame();
String enteries[] = {"Delta" , "Tango" , "fed"};
list = new JList(enteries);
JPanel panel = new JPanel();

frame.setSize(300,300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EX…
frame.getContentPane().add(BorderLayout.…
panel.add(list);

JScrollPane scroller = new JScrollPane(list);
scroller.setVerticalScrollBarPolicy(Scro…
scroller.setHorizontalScrollBarPolicy(Sc…
panel.add(scroller);

list.setVisibleRowCount(4);
list.setSelectionMode(ListSelectionModel…

list.addListSelectionListener(new inner());
}

class inner implements ListSelectionListener{ // the inner word is underlined in red why ?
public void valueChaned(ListSelectionEvent lse){

if(!lse.getValueIsAdjusting()){
String selection = (String) list.getSelectedValue();
JOptionPane.showMessageDialog(null,selec…
}
}


}
}