javafx application window doesn't appear after run main.java

Question

I am working on eclipse javafx project and this is the Main.java

package application;
    
import javafx.application.Application;

import javafx.stage.Stage;
import javafx.scene.Scene;
import javafx.scene.layout.BorderPane;
import javafx.fxml.FXMLLoader;


public class Main extends Application {
    
    @Override
    public void start(Stage primaryStage) {
        try {
            BorderPane root = (BorderPane)FXMLLoader.load(getClass().getResource("Sample.fxml"));
            Scene scene = new Scene(root);
            scene.getStylesheets().add(getClass().getResource("application.css").toExternalForm());
            primaryStage.setScene(scene);
            primaryStage.setTitle("Restaurant");
            primaryStage.show();
        } catch(Exception e) {
            e.printStackTrace();
        }
        
    }
    
    public static void main(String[] args) {
        launch(args);
    }
}

and eclipse doesn't show any error, but after run the program

-> nothing appear on the screen

and I don't why?