Error in the console.

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) {
    boolean isHit = mAnswer.indexOf(letter) >= 0;
    if (isHit) {
      mHits += letter;
    } else {
      mMisses += letter;
    }
    return isHit;
  }
}

import java.io.console;

public class Prompter {
  private Game mGame;

  public Prompter(Game game) {
    mGame = game;
  }
  public boolean promptForGuess() {
    Console console = System.console();
    String guessAsString = console.readLine("Enter a letter: ");
    char guess = guessAsString.charAt(0);
    return mGame.applyGuess(guess);
  }

public class Hangman {

    public static void main(String[] args) {
        // Enter amazing code here:
        Game game = new Game("treehouse");
        Prompter prompter = new Prompter(game);
        boolean isHit = prompter.promptForGuess();
        if (isHit) {
        System.out.println("We got a hit!");
        } else {
          System.out.println("Whoops that was a miss");
        } 
    }

}