Compile error

Jeg er ved at compile noget men min compiler kommer op med noget om at addpanel ikke er abstract, addpanel er selve filen...



  import java.awt.*;
  import javax.swing.*;
  import java.io.*;
  import java.awt.event.*;
       
    public class AddPlayerPanel extends JPanel implements ActionListener
  {
      public AddPlayerPanel() throws IOException
      {
        setBackground (Color.white);
        setLayout (new GridLayout (17, 2));
            JButton Submit = new JButton ("Save");
     
        JLabel Home = new JLabel ("Fill in the following fields with the appropriate data, and press the save button" + "\n" + " when all fields have been completed.");
        JLabel Blank= new JLabel ("");
          JLabel Blank2= new JLabel ("");     
            JLabel firstnamelabel = new JLabel ("First name:");
        JTextField firstname = new JTextField ();

     
      //first row
        add(Home);
        add(Blank);
     
      //second row
        add(firstnamelabel);
        add(firstname);

        add(Blank2);
        add(Submit);
           
   
     
        Submit.addActionListener(this);
     
      }
     
  }

hvad er problemet? jeg skal bare have en kanp der skal have en actionlistener.