当我尝试在JavaFx程序中添加按钮时，会出现错误

Question

当我添加按钮代码时，出现错误，程序在运行时将崩溃。但是当我删除代码 对于该按钮，该程序将运行，并且将仅显示不带任何内容的窗口。我希望显示没有功能的按钮，但给出一个错误。我想念什么吗？请帮忙。

package guiTutorials;
import javafx.fxml.FXML;
import javafx.scene.control.Button;
import javafx.application.Application;
import javafx.scene.Scene;
import javafx.scene.layout.StackPane;
import javafx.stage.Stage;

import javafx.event.ActionEvent;

public class buckyTutorialOne extends Application{

 private Button button;


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

 }
  @Override
   public void start(Stage stage) throws Exception {
    //Java fx code written here
    //the window is called the stage
    //content inside the stage is the  scene
    //the scene is composed of components like widgets, buttons, 
  etc.\
    //layout- how you want everything arranged on your screen
  try {
   stage.setTitle("Title of the Window"); //helps set stage

  button = new Button();         //component for scene sets stage
  button.setText("Click Me");


     StackPane layout = new StackPane();  //layout sets stage
  layout.getChildren().add(button);

    Scene scene = new Scene(layout, 300, 250);//setting the scene
   stage.setScene(scene);
    stage.show();
   }
  catch(Exception e){
    e.printStackTrace();
    }


     }
   }

这是我得到的结果：

Exception in Application start method
java.lang.reflect.InvocationTargetException
at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native 
Method)
at 
java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke
(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.
launchApplicationWithArgs(LauncherImpl.java:464)
at 
javafx.graphics/com.sun.javafx.application.LauncherImpl.
launchApplication
(LauncherImpl.java:363)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(
Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(
NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke
(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at 
java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java
 :1051)
 Caused by: java.lang.RuntimeException: 
Exception in Application start method
at javafx.graphics/com.sun.javafx.application.LauncherImpl.
launchApplication1(LauncherImpl.java:900)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.
lambda$launchApplication$2(LauncherImpl.java:195)
at java.base/java.lang.Thread.run(Thread.java:835)
Caused by: java.lang.IllegalAccessError: superclass access check 
failed: class com.sun.javafx.scene.control.ControlHelper 
(in unnamed module @0x5f8dfd9d) cannot access class 
com.sun.javafx.scene.layout.RegionHelper (in module javafx.graphics) 
because module javafx.graphics does not export 
com.sun.javafx.scene.layout to unnamed module @0x5f8dfd9d
at java.base/java.lang.ClassLoader.defineClass1(Native Method)
at java.base/java.lang.ClassLoader.defineClass(ClassLoader.java:1016)
at java.base/java.security.SecureClassLoader.defineClass
(SecureClassLoader.java:151)
at java.base/jdk.internal.loader.BuiltinClassLoader.defineClass
(BuiltinClassLoader.java:802)
at java.base/jdk.internal.loader.BuiltinClassLoader.
findClassOnClassPathOrNull(BuiltinClassLoader.java:700)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClassOrNull
(BuiltinClassLoader.java:623)
at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass
(BuiltinClassLoader.java:581)
at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass
(ClassLoaders.java:178)
at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521)
at javafx.scene.control.Control.<clinit>(Control.java:86)
at guiTutorials.buckyTutorialOne.start(buckyTutorialOne.java:30)
at javafx.graphics/com.sun.javafx.application.LauncherImpl.
lambda$launchApplication1$9(LauncherImpl.java:846)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.
lambda$runAndWait$12(PlatformImpl.java:455)
at 
javafx.graphics/com.sun.javafx.application.PlatformImpl.
lambda$runLater$10(PlatformImpl.java:428)
at java.base/java.security.AccessController.doPrivileged
(AccessController.java:389)
at javafx.graphics/com.sun.javafx.application.PlatformImpl.
lambda$runLater$11(PlatformImpl.java:427)
at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run
(InvokeLaterDispatcher.java:96)
Exception running application guiTutorials.buckyTutorialOne

Process finished with exit code 1