BigInteger could not be instanciated with Zenaku(Multi-byte) "0".

import java.math.*;

public class into{
        public static void main(String[] arg){
                BigInteger n = new BigInteger("£±"); <- Zenkaku 1
                System.out.println(n.toString());
                BigInteger o = new BigInteger("£°"); <- Zenkaku 0
                System.out.println(o.toString());
        }
}

sishida@stones->java into
1
java.lang.ArrayIndexOutOfBoundsException: 0
        at java.math.BigInteger.toString(BigInteger.java:1152)
        at java.math.BigInteger.toString(BigInteger.java:1191)
        at into.main(into.java:8)