I get an error message while compiling Hangman.

public static void main(String[] args) {

    Game game = new Game("treehouse");
    while (game.getRemainingTries() > 0 && !game.isWon())  {

        Prompter prompter = new Prompter(game);
        prompter.displayProgress();
        prompter.promptForGuess();
    }

    prompter.displayOutcome();
}

public Prompter(Game game) {
    this.game = game;
}

public boolean promptForGuess() {
    Scanner scanner = new Scanner(System.in);
    boolean isHit = false;
    boolean isAcceptable = false;

    do {
        System.out.print("Enter a letter:   ");
        String guessInput = scanner.nextLine();
        char guess = guessInput.charAt(0);
        try {
            isHit = game.applyGuess(guess);
            isAcceptable = true;

        } catch(IllegalArgumentException iae) {

            System.out.printf("%s, Please try again. %n",
                iae.getMessage());
        }
    } while (!isAcceptable);
    return isHit;

}

public void displayProgress() {
    System.out.printf("you have %d tries left to solve:  %s%n",
        game.getRemainingTries(),
        game.getCurrentProgress());
}
public void displayOutcome() {
    if (game.isWon()) {
        System.out.printf("Congratulations! you have won with %d tries left. %n",
            game.getRemainingTries());
    } else {
        System.out.printf("Sorry, you lost. the word was: %s",
            game.getAnswer());
    }
}