"Might be null" problem withFXMLLoader.load.getClass().getResource()

[sonic copper]

I am trying to run this small code but I have a problem at this line of the code that I don't know how to fix.

[vernal pecan]

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[quartz ruin]

I know nothing about JavaFX, but this suggests that you have a module-info.java
Generally speaking, a screenshot may have been useful if it showed your project layout, but:

• it doesn't show your project layout, so the screenshot is 100% useless
• can't copy/paste the code and verify it's all there
• can't copy/paste the error and it's truncated

[sonic copper]

This is the project layout

package InterfacePackage;

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


public class Main extends Application {

    @Override
    public void start(Stage primaryStage) throws Exception {
        FXMLLoader loader = new FXMLLoader(getClass().getResource("InterfacePackage/HyttInterface2.fxml"));
        Parent root = loader.load();
        primaryStage.setTitle("Hello World");
        primaryStage.setScene(new Scene(root, 800, 500));
        primaryStage.show();
    }

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

package InterfacePackage;

public class Controller {
    public void loginButtonClicked() {
        System.out.println("User logged in... ");
    }
}

Caused by: java.lang.IllegalAccessException: class com.sun.javafx.application.LauncherImpl (in module javafx.graphics) cannot access class InterfacePackage.Main (in module com.example.summerholiday) because module com.example.summerholiday does not export InterfacePackage to module javafx.graphics

[twin island]

You have to follow the error message and do what it tells you to do:

export module com.example.summerholiday to javafx.graphics