What kind of error is this

Question

C:\source>java Average1
Assertion failed: offset < fFileSize, file ..\..\..\..\src\share\native\sun\awt\
font\fontmanager\fontobjects\fontObject.cpp, line 240
abnormal program termination
the above source code can be compiled
but when i run java it occurs above error
ive tried to install back my java jdk 1.3 on windows 2000 but it still has the same result
its weird that at my friends computer it can run well
my email [email protected]

Answer 1

import javax.swing.JOptionPane;
public class Average1 {
public static void main( String args[] )
int total, // sum of grades
gradeCounter, // number of grades entered
gradeValue, // grade value
average; // average of all grades
String grade; // grade typed by user
// Initialization Phase
total = 0; // clear total
gradeCounter = 1; // prepare to loop
// Processing Phase
while ( gradeCounter <= 10 ) {  // loop 10 times
// prompt for input and read grade from user
grade = JOptionPane.showInputDialog(
"Enter integer grade: " );
// convert grade from a String to an integer
gradeValue = Integer.parseInt( grade );
// add gradeValue to total
total = total + gradeValue;
// add 1 to gradeCounter
gradeCounter = gradeCounter + 1;
// Termination Phase
average = total / 10; // perform integer division
// display average of exam grades
JOptionPane.showMessageDialog(
null, "Class average is " + average, "Class Average",
JOptionPane.INFORMATION_MESSAGE );
System.exit( 0 ); // terminate the program