Hello Yakov,
I imported the TicTacToe module into IntelliJ IDEA 14.0.2. I get a runtime exception in Application start method, caused by java.lang.NullPointerException: Location is required. It looks like FXMLLoader.load(getClass().getResource("tictactoe.fxml") returns null, although the FXML file is located in the same directory as the application. I have the same problem with the Calculator from Chapter 7.
Best regards,
Cristina