Is there a reason my grid is not working?

 import javafx.application.Application;
 import javafx.scene.Group;
 import javafx.scene.Scene;
 import javafx.scene.layout.GridPane;
 import javafx.scene.layout.HBox;
 import javafx.scene.layout.VBox;
 import javafx.scene.text.Text;
 import javafx.stage.Stage;

 public class jaredProjectClass extends Application{

@Override
public void start(Stage primaryStage) throws Exception {
    Group root = new Group();
    Text txt = new Text("StyleMe");
    Text txt1 = new Text("StyleMe");
    GridPane grid = new GridPane();
    grid.add(txt, 0, 0);
    grid.add(txt1, 1, 1);
    VBox box = new VBox();
    box.getChildren().addAll(grid,txt,txt1);
    root.getChildren().add(box);
    primaryStage.setTitle("SmileButtons");
    primaryStage.setScene(new Scene(root, 300, 275));
    primaryStage.show();
}

public static void main(String[] args) {
    launch(args);
}
 }