One Hangman error, would appreciate help.

public class Hangman {

    public static void main(String[] args) {
        // Enter amazing code here:
        Game game = new Game("treehouse");
        Prompter prompter = new Prompter(game); //pass game object ,created above, into Prompter; now Prompter knows about game logic
        boolean isHit = prompter.promptForGuess(); //call method on prompter object
        if (isHit) {
          System.out.println("We got a hit"); }
        else {
          System.out.println("Whooops that was a miss"); }

    }

}

import java.io.Console;

public class Prompter {// object to do i/o
  private Game mGame; 

  public Prompter(Game game) {//constructor takes Game object called game
    mGame = game; //set mGame to what was passed in (game)
  }

  public boolean prompForGuess() { // returns T/F
    Console console = System.console();// Console is a class importing from java.io
    String guessAsString = console.readLine("Enter a letter: ");
    char guess = guessAsString.charAt(0);
    return mGame.applyGuess(guess);//call applyGuess method, pass in guess(1st char from string)return T/F
}
}  

public class Game {
  private String mAnswer;
  private String mHits;
  private String mMisses;

  public Game(String answer) {
   mAnswer = answer;
   mHits = "";
   mMisses = "";

  }

  public boolean applyGuess(char letter) {//method to apply a guess towards the puzzle, takes a letter, returns T if hit, F  for miss
    boolean isHit = mAnswer.indexOf(letter) >= 0; //boolean value knows whether or not guess is good, mAnswer = Treehouse
    if (isHit) {
      mHits += letter; //update hit count
    } else {
      mMisses += letter;
    }

    return isHit; 

}
}