InvocationTargetException with javafx launch - javafx

Question

I have some trouble with launching a javafx application. To explain, I wrote a code that worked but I was on Ubuntu 19.04 and I decided to reinstall my Linux version (20.04). I copied my code and reinstalled e(fx)clipse, scenebuilder, openjfx, and imported the same jfxrt.jar but nothing worked. I can't manage to launch javafx application, even if the code is empty (ig code). Oh and I have to use java 8 for this homework.
Can you help me please?
Here is my code
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.FlowPane;
import javafx.stage.Stage;
public class LaunchApplication extends Application {
public static void main(String[] args) {
launch(args);
}
//Empty but still error
#Override
public void start(Stage arg0) throws Exception {
}
//Old code, doesnt work anymore
// #Override
// public void start(Stage primaryStage) throws Exception {
// try {
//
// FXMLLoader loader = new FXMLLoader();
// loader.setLocation(getClass().getResource("view/Login.fxml"));
// Parent root = loader.load();
//
// Scene scene = new Scene(root);
// primaryStage.setScene(scene);
// primaryStage.setResizable(true);
// primaryStage.show();
//
// } catch (Exception e) {
// System.out.println(e);
// }
//
// }
}
And there my error when running it
Exception in thread "main" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: java.lang.NoSuchMethodError: <init>
at com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:288)
at com.sun.javafx.application.PlatformImpl.startup(PlatformImpl.java:211)
at com.sun.javafx.application.LauncherImpl.startToolkit(LauncherImpl.java:675)
at com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:337)
at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
... 5 more
Caused by: java.lang.NoSuchMethodError: <init>
at java.lang.ClassLoader$NativeLibrary.load(Native Method)
at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1934)
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1817)
at java.lang.Runtime.load0(Runtime.java:810)
at java.lang.System.load(System.java:1088)
at com.sun.glass.utils.NativeLibLoader.loadLibraryInternal(NativeLibLoader.java:107)
at com.sun.glass.utils.NativeLibLoader.loadLibrary(NativeLibLoader.java:39)
at com.sun.glass.ui.gtk.GtkApplication.lambda$new$5(GtkApplication.java:156)
at java.security.AccessController.doPrivileged(Native Method)
at com.sun.glass.ui.gtk.GtkApplication.<init>(GtkApplication.java:140)
at com.sun.glass.ui.gtk.GtkPlatformFactory.createApplication(GtkPlatformFactory.java:41)
at com.sun.glass.ui.Application.run(Application.java:146)
at com.sun.javafx.tk.quantum.QuantumToolkit.startup(QuantumToolkit.java:278)
... 9 more
```