每次尝试保存图像时都会出现此错误。我可以通过这个代码选择图像，我按下保存按钮，但我没有找到保存的图像在我的电脑上的任何地方，而是我得到以下错误。我使用的是Eclipse2020-9和java版本15.0.1。这是错误：java.lang.noclassdeffounderror:javafx/embed/swing/swingfxutils有什么帮助吗？

package application;

import java.awt.Desktop;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javafx.application.Application;
import javafx.embed.swing.SwingFXUtils;
import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.geometry.Insets;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.Menu;
import javafx.scene.control.MenuBar;
import javafx.scene.control.MenuItem;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.layout.StackPane;
import javafx.scene.layout.VBox;
import javafx.stage.FileChooser;
import javafx.stage.Stage;
import javax.imageio.ImageIO;

/**
 *
 * @web http://java-buddy.blogspot.com
 */
public class Main extends Application {

    @Override
    public void start(Stage primaryStage) {

        final FileChooser fileChooser = new FileChooser();
        final Button openButton = new Button("Open Image");

        openButton.setOnAction(
            new EventHandler<ActionEvent>() {
                @Override
                public void handle(final ActionEvent e) {
                    setExtFilters(fileChooser);
                    File file = fileChooser.showOpenDialog(primaryStage);
                    if (file != null) {
                        openNewImageWindow(file);
                    }
                }
            });

        StackPane root = new StackPane();
        root.getChildren().add(openButton);

        Scene scene = new Scene(root, 400, 150);

        primaryStage.setTitle("java-buddy.blogspot.com");
        primaryStage.setScene(scene);
        primaryStage.show();
    }

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

    private void setExtFilters(FileChooser chooser){
        chooser.getExtensionFilters().addAll(
                new FileChooser.ExtensionFilter("All Images", "*.*"),
                new FileChooser.ExtensionFilter("PNG", "*.png")
        );
    }

    private void openNewImageWindow(File file){
        Stage secondStage = new Stage();

        MenuBar menuBar = new MenuBar();
        Menu menuFile = new Menu("File");
        MenuItem menuItem_Save = new MenuItem("Save Image");
        menuFile.getItems().addAll(menuItem_Save);
        menuBar.getMenus().addAll(menuFile);

        Label name = new Label(file.getAbsolutePath());
        Image image = new Image(file.toURI().toString());
        ImageView imageView = new ImageView();

        menuItem_Save.setOnAction(new EventHandler<ActionEvent>() {

            @Override
            public void handle(ActionEvent event) {
                FileChooser fileChooser = new FileChooser();
                fileChooser.setTitle("Save Image");

                File file = fileChooser.showSaveDialog(secondStage);
                if (file != null) {
                    try {
                        ImageIO.write(SwingFXUtils.fromFXImage(imageView.getImage(),
                                null), "png", file);
                    } catch (IOException ex) {
                        Logger.getLogger(
                            Main.class.getName()).log(Level.SEVERE, null, ex);
                    }
                }
            }
        });

        final VBox vbox = new VBox();
        vbox.setAlignment(Pos.CENTER);
        vbox.setSpacing(10);
        vbox.setPadding(new Insets(0, 10, 0, 10));
        vbox.getChildren().addAll(name, imageView);

        imageView.setFitHeight(400);
        imageView.setPreserveRatio(true);
        imageView.setImage(image);
        imageView.setSmooth(true);
        imageView.setCache(true);

        Scene scene = new Scene(new VBox(), 400, 350);
        ((VBox)scene.getRoot()).getChildren().addAll(menuBar, vbox);

        secondStage.setTitle(file.getName());
        secondStage.setScene(scene);
        secondStage.show();
    }

}