I cant Figure out what is wrong with my Code here is what I have

package starString;

public class starString {

public static void main(String[] args) { for (int i = 0; i <= 4; i++) System.out.println(starString(i)); } public static String StarString (int n) { if (n < 0 ) throw new IllegalArgumentsException(); else if (n==0) return "*"; else return starString (n-1) + starString (n-1); }

}

Instructions:

. Write a recursive method called starString that accepts an integer as a parameter and prints to the console a string of stars (asterisks) that is 2 n (i.e., 2 to the n th power) long. For example,

• starString(0) should print * (because 2 ⁰ == 1)

• starString(1) should print ** (because 2 ¹ == 2)

• starString(2) should print **** (because 2 ² == 4)

• starString(3) should print ******** (because 2 ³ == 8)

• starString(4) should print **************** (because 2 ⁴ == 16)

The method should throw an IllegalArgumentException if passed a value less than 0.

any help would be great thank you in advance