I get a compiler error, I do not understand

public class ScrabblePlayer {
  // A String representing all of the tiles that this player has
  private String tiles;

  public ScrabblePlayer() {
    tiles = "";
  }

  public String getTiles() {
    return tiles;
  }

  public void addTile(char tile) {
    tiles += tile;
    // TODO: Add the tile to tiles

  }

  public boolean hasTile(char tile) {
    boolean hasIt = answer.indexOf(tile) != -1;
      if (hasIt){
        return true;
      } else  {
        return false;
      }
  }

}