Can anyone spot the problem with this coding??

Question

can anyone spot this problem with my program. it keeps saying
"missing return statement } " with a little arrow beneath the bracket.
many thanks
public class Game extends GameInterface
     GameInterface gameInt = new GameInterface();
     String boardString;
     // final static char NOUGHT='O', CROSS='X';
     private int square = 0;
     Player player1 = new Player();
     Player player2 = new Player();
     String firstPlayer, secondPlayer;
     public Game() // Constructor
          boardString = "0123456789";
public boolean initialise(boolean first)
               gameInt.setPlayerNames(player1,player2);
          MyPrint.myPrintln("Player one name is " + player1.getName());
          MyPrint.myPrintln("Player two name is " + player2.getName());
          String P1 = player1.getName();
          String P2 = player2.getName();
}

Answer 1

It means you declare your method to return something, but you don't actually return anything.