I can't get this code to run. I keep getting an unresolved compilation problem in the "main". Please help!

import java.util.*;

import java.io.*;

public class Message {

String recipient;

String sender;

String text;

public Message(String recip, String send){

recipient = recip;

sender = send;

}

public void append(String txt){

text = txt;

}

public String toString(){

return "To: " + recipient + " From: " + sender + " : " + text + " ";

}

public static void main(String[] args){

Message one = new Message("Harry", "Hagrid");

one.append("Hi");

System.out.print(one.toString());

}

}