Whenever I try to write code in JavaFX I always get the same error. What am I doing wrong?

Question

Code:

package learning;

import javafx.application.Application;
import javafx.stage.Stage;

public class One extends Application {

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

    @Override
    public void start(Stage stage) throws Exception {


    }
}

Error:

Exception in Application constructor Exception in thread "main"
java.lang.reflect.InvocationTargetException 
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native
Method) 
        at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
        at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.base/java.lang.reflect.Method.invoke(Method.java:568)
        at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1071)
Caused by: java.lang.RuntimeException: Unable to construct Application
instance: class learning.One
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:893)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:198)
        at java.base/java.lang.Thread.run(Thread.java:833) Caused by:
java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics) cannot access class learning.One (in module com.example.hoho) because module com.example.hoho does not export learning to module javafx.graphics
        at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:392)
        at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:674)
        at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:489)
        at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480)
        at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$8(LauncherImpl.java:805)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:474)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:447)
        at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
        at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:446)
        at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native
Method)
        at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
        ... 1 more

I've downloaded JavaFX and have put it into my project structure already, and since I'm working in Intellij all the example classes that I get when I first open a new project work. However, whenever I try to write my own code this error always comes up. Any help please?

Answer 1

The crucial part is here:

class com.sun.javafx.application.LauncherImpl (in module javafx.graphics)
cannot access class learning.One (in module com.example.hoho) because 
module com.example.hoho does not export learning to module javafx.graphics

You will have to add that to your module-info.java.