В методе windowClosing не найден метод exit() в переменной view. В классе FrameListener.
package com.javarush.task.task32.task3209;
import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class View extends JFrame implements ActionListener {
private Controller controller;
private JTabbedPane tabbledPane = new JTabbedPane();
private JTextPane htmlTextPane = new JTextPane();
private JEditorPane plainTextPane = new JEditorPane();
public Controller getController() {
return controller;
}
public void setController(Controller controller) {
this.controller = controller;
}
public void init(){}
public void exit(){
controller.exit();
}
@Override
public void actionPerformed(ActionEvent e) {
}
}