Exception in thread "main" java.util.IllegalFormatWidthException: 13

[xtrive]

Hello every1,
Im starting to self learn java from a book, now im in the middle of an exercise and i got this line "Exception in thread "main" java.util.IllegalFormatWidthException: 13" in the run window, working with netbeans 6.5.1 and this is the code:

 public class Functions {
    public static int power (int base, int n) {
    int result=1;
 
    for (int i=1 ; i<=n ; ++i)
        result = result * base;
                return result;
 
    }
    public static void main(String[] args) {
        int res1, res2;
        System.out.printf("%-4s %-13s %-13n", "i", "power(2,i)", "power(3,i)");
        System.out.printf("%-4s %-13s %-13s%n", "-", "--------", "--------");
        for (int i=0; i<10; ++i) {
            res1 = power(2,i);
            res2 = power(3,i);
            System.out.printf("%-4d %-13d %-13d%n", i, res1, res2);
        }
 
    }
}

can any1 plz show me the problem ?

Thank you very much !!