Ошибка: не удалось найти или загрузить основной класс javafx.controls. Причина: java.lang.ClassNotFoundException: javafx.controls,

      public class Main extends Application
{
    /**
     * Uses the ExoplanetFileHandler class to retrieve exoplanet data and displays it.
     * @param args
     *          Not used.
     */
    public static void main(String[] args)
    {
        launch(args);
        System.out.println("Testing the exoplanet file.");
        //  Create the file handle.
        File exoplanetsFile = new File("data", "exoplanets.readings");
        // Use the readExoplanets static methods to retrieve the data stored in the file.
        Telescope telescope = ExoplanetFileHandler.readExoplanets(exoplanetsFile);
        if (telescope != null) {
            // Output the scan of the telescope.
            System.out.println(telescope.scan());
        } else {
            System.out.println("Could not load the telescope. Therefore, cannot display exoplanet data.");
        }
    }

    @Override
    public void start(Stage arg0) throws Exception {
        // TODO Auto-generated method stub
        //arg0.setScene(null);
        arg0.show();
    }
    
    
}

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