Incompatible types error - im so confused.

public void addItem(Product item, int quantity) {
    System.out.printf("Adding %d of %s to the cart.%n", quantity, item.getName());
    /* Other code omitted for clarity */
  }
public void addItem(Product addedItem) {
addItem(addedItem, 1);
}

import java.io.Console; // clas were importing from java IO

public class Prompter{
  private Game mGame; //member variable 

  public Prompter(Game game){
    mGame = game;
  }
    //example.charAt(0); 

  public void play(){ // limit scope to the story were working on
    while(mGame.getRemainingTries() > 0) {
      displayProgress();
      promptForGuess();
    }
  } 

   public boolean promptForGuess(){
      Console console = System.console();
      boolean isHit = false;
      boolean isValidGuess = false; //starts false
      while(! isValidGuess){
        String guessAsString = console.readLine("Enter a letter: "); 
        try{
          isHit = mGame.applyGuess(guessAsString); 
          isValidGuess = true;
        } catch (IllegalArgumentException iae){
          console.printf("%s. Please try again.\n", iae.getMessage()); 
        }
      }
      return isHit;
    }

    public void displayProgress(){
     System.out.printf("You have %d tries left to solve: %s\n",                                mGame.getRemainingTries(), 
                       mGame.getCurrentProgress());
    }
  }