The java code below is building successfully but when I run it its coming up with an error message and there is no dialog box. Can I get some help and pointers where I am going wrong?

import javax.swing.JOptionPane;

/** This program demonstrates using dialogs with JOptionPane. */

public class ScoreDialog1 { public static void main(String[] args) { String inputString; // For reading input int Score1; // first score int Score2; // second scpre int Score3; // third score double Average; // The average

// Get the user's scores. inputString = JOptionPane.showInputDialog("Score1 ");

// Convert the input to an int. Score1 = Integer.parseInt(inputString); inputString = JOptionPane.showInputDialog("Score2 ");

// Convert the input to an int. Score2 = Integer.parseInt(inputString); inputString = JOptionPane.showInputDialog("Score3 ");

// Convert the input to an int. Score3 = Integer.parseInt(inputString); // Get the hourly pay rate. inputString = JOptionPane.showInputDialog("What is the average? ");

// Convert the input to a double. Average = Double.parseDouble(inputString); // Calculate the gross pay. Average = (Score1 + Score2 + Score3) /3.0; // Display the results. JOptionPane.showMessageDialog(null, "Score1 = " + Score1 + " ");

JOptionPane.showMessageDialog(null, "Score2 = " + Score2 + " ");

JOptionPane.showMessageDialog(null, "Score3 = " + Score3 + " ");

JOptionPane.showMessageDialog(null, "Average = " + Average +" ");

// End the program. System.exit(0); } }