Error message: local variable is access from within inner class

import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
 
public class QuizGUI3000 extends JFrame {
  // Declare components as instance variables
  private JTextField myText = new JTextField("The answer will display here.");
  private JButton myButton = new JButton("Next Question >>");
  private JLabel labelWithText = new JLabel("The question displays here.");
  
  //Constructor
  public QuizGUI3000() {
    
        //System.out.print ("Enter file name: ");    
        //Scanner keyboard = new Scanner (System.in);
    
        String[] ques = new String[10];
        String[] ans = new String[10];
        int cnt = 0;
        int pointer = 0;
       
        String fileName = "questions.txt";        
        Scanner inputStream = null;
 
        try
        {
            inputStream = new Scanner (new File (fileName));
        }
        catch (FileNotFoundException e)
        {
            System.out.println ("Error opening the file " + fileName );
                    System.exit (0);
        }
        while (inputStream.hasNextLine ())
        {
           String line = inputStream.nextLine ();
           ques[cnt] = line;
           cnt++;
        }
        inputStream.close ();
 
        public void showNextQuestion() {
                labelWithText.setText(ques[pointer]);
                pointer++;
        }
        
        // Set up the frame
        setLayout(new GridLayout(2,2,5,5));
        add(myText);
        add(myButton);
        add(labelWithText);
        
        // Add an event handler
        myButton.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent e) {
          showNextQuestion();
      }
    });
    }
  
 
    public static void main (String [] args)
    {
      QuizGUI3000 myFrame = new QuizGUI3000();
      myFrame.setVisible(true);
      myFrame.setTitle("Quiz GUI 3000");
      myFrame.setSize(500, 150);
        
    }
}
                                              

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// Add an event handler
        myButton.addActionListener(new ActionListener() {
          public void actionPerformed(ActionEvent e) {
          labelWithText.setText(ques[0]);

                                              

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