where am i wrong

package com.codegym.task.task32.task3209; import com.codegym.task.task32.task3209.listeners.FrameListener; import com.codegym.task.task32.task3209.listeners.TabbedPaneChangeListener; import javax.swing.*; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; public class View extends JFrame implements ActionListener { private Controller controller; private JTabbedPane tabbedPane = 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; } @Override public void actionPerformed(ActionEvent actionEvent) { } public void init(){ initGui(); FrameListener frameListener = new FrameListener(this); setVisible(true); setResizable(true); addWindowListener(frameListener); } public void initMenuBar() {} public void initEditor() { htmlTextPane.setContentType("text/html"); JScrollPane htmlScorllPane = new JScrollPane(htmlTextPane); tabbedPane.addTab("HTML", htmlScorllPane); JScrollPane plainTextScrollPane1 = new JScrollPane(plainTextPane); tabbedPane.addTab("Text", plainTextScrollPane1); tabbedPane.setPreferredSize(new Dimension(700, 500)); tabbedPane.addChangeListener(new TabbedPaneChangeListener(this)); this.getContentPane().add(tabbedPane, BorderLayout.CENTER); } public void initGui() { initMenuBar(); initEditor(); pack(); } public void selectedTabChanged() { } public void exit() { controller.exit(); } }