JavaFX java.lang.reflect.InvocationTargetException issue PROJECT SETUP ISSUE

Question

Hello I am new in JavaFx, I'm trying to build a login/signup application, I think my code is correct and my big issue is a NULL statement or a project setup that I can't see to fix. I tried to follow most of the answers in similar questions but I understand I don't have the same issue. Don't mind the italian comments and thank you in advance and kind regards.

Here's the error window I get, as a beginner I got a bit overwhelmed, what seems to be the issue in the main? I'll also include an image of my project setup

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:77)
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.base/java.lang.reflect.Method.invoke(Method.java:568)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:465)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:364)
    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$FXHelper.main(LauncherHelper.java:1071)
Caused by: java.lang.RuntimeException: Exception in Application start method
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:901)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:196)
    at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: java.lang.NullPointerException
    at java.base/java.util.Objects.requireNonNull(Objects.java:208)
    at com.example.loginsignup/com.example.loginsignup.HelloApplication.start(HelloApplication.java:16)
    at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$9(LauncherImpl.java:847)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runAndWait$12(PlatformImpl.java:484)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:457)
    at java.base/java.security.AccessController.doPrivileged(AccessController.java:399)
    at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:456)
    at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$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:184)
    ... 1 more
Exception running application com.example.loginsignup.HelloApplication

Process finished with exit code 1

Here's my Controller

package com.example.loginsignup;

import javafx.event.ActionEvent;
import javafx.event.EventHandler;
import javafx.fxml.FXML;
import javafx.fxml.Initializable;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;

import java.net.URL;
import java.util.ResourceBundle;

public class HelloController implements Initializable { //controller per pulsanti login e signup


    @FXML
    private TextField tf_username;

    @FXML
    private TextField tf_password;

    @FXML
    private Button button_login;

    @FXML
    private Button button_signup;

    @Override
    public void initialize(URL location, ResourceBundle resourceBundle) { //richiamo metodi per il pulsante di login
        button_login.setOnAction(new EventHandler() {
            @Override
            public void handle(ActionEvent actionEvent) {
                DBUtil.logInUser(actionEvent, tf_username.getText(), tf_password.getText()); //passo tutto da DBUtil per il login
            }
        });

        button_signup.setOnAction(new EventHandler() {
            @Override
            public void handle(ActionEvent actionEvent) {
                DBUtil.changeScene(actionEvent,"signup.fxml", "Sign Up", "null");
            }
        });

    }
}

Here's my main

package com.example.loginsignup;

import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.stage.Stage;

import java.util.Objects;

public class HelloApplication extends Application {
    @Override
    public void start(Stage stage) throws Exception {

        Parent root;
        root = FXMLLoader.load(Objects.requireNonNull(getClass().getResource("sample.fxml")));
        stage.setTitle("Log in");
        stage.setScene(new Scene(root, 600, 400));
        stage.show(); //1:14:24

    }

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

and the sample.fxml as the front page, I did not put my login and signup controller, DBcontroller nor their respective .fxml files as they are correct

Here's the project setup:

JavaFX java.lang.reflect.InvocationTargetException issue PROJECT SETUP ISSUE

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