Alguém poderia me ajudar com esse problema: "javafx.fxml.LoadException:" no JavaFX (Eclipse) que não roda usando SceneBuilder

Programação Java
#1

Main.java

package application;

import java.io.IOException;

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 stage) {
		try {
			Parent parent = FXMLLoader.load(getClass().getResource("/gui/View.fxml"));
			Scene scene = new Scene(parent);
			stage.setScene(scene);
			stage.show();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

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

ViewController.java

package gui;

import java.util.Locale;

import gui.util.Alerts;
import javafx.fxml.FXML;
import javafx.scene.control.Alert.AlertType;
import javafx.scene.control.Button;
import javafx.scene.control.Label;
import javafx.scene.control.TextField;

public class ViewController {
	
	@FXML
	private TextField txtNumber1;
	
	@FXML
	private TextField txtNumber2;
	
	@FXML
	private Label labelResult;
	
	@FXML
	private Button btSum; 
	
	@FXML
	public void onBtSumAction() {
		try {
		Locale.setDefault(Locale.US);
		double number1 = Double.parseDouble(txtNumber1.getText());
		double number2 = Double.parseDouble(txtNumber2.getText());
		double sum = number1 + number2;
		labelResult.setText(String.format("%.2f", sum));
		}
		catch (NumberFormatException e) {
		Alerts.showAlert("Error", "Parse error", e.getMessage(), AlertType.ERROR);
		}
	}
}

View.fxml

<?xml version="1.0" encoding="UTF-8"?>

<?import javafx.scene.control.Button?>
<?import javafx.scene.control.Label?>
<?import javafx.scene.control.TextField?>
<?import javafx.scene.layout.AnchorPane?>
<?import javafx.scene.text.Font?>

<AnchorPane prefHeight="300.0" prefWidth="400.0" xmlns="http://javafx.com/javafx/16" xmlns:fx="http://javafx.com/fxml/1" fx:controller="gui.ViewController">
   <children>
      <Label layoutX="28.0" layoutY="48.0" text="Calculate Sum">
         <font>
            <Font name="System Bold" size="13.0" />
         </font>
      </Label>
      <TextField fx:id="txtNumber1" layoutX="28.0" layoutY="77.0" promptText="First Number" />
      <TextField fx:id="txtNumber2" layoutX="29.0" layoutY="125.0" promptText="Second Number" />
      <Button fx:id="btSum" layoutX="29.0" layoutY="176.0" mnemonicParsing="false" onAction="#onBtSumAction" text="Sum" />
      <Label layoutX="35.0" layoutY="223.0" text="Result = " />
      <Label fx:id="labelResult" layoutX="86.0" layoutY="224.0" />
   </children>
</AnchorPane>

Alerts.java

package gui.util;

import javafx.scene.control.Alert;
import javafx.scene.control.Alert.AlertType;

public class Alerts {
	public static void showAlert(String title, String header, String content, AlertType type) {
		Alert alert = new Alert(type);
		alert.setTitle(title);
		alert.setHeaderText(header);
		alert.setContentText(content);
		alert.show();
	}
}

Module-info.java

module javafx1 {
	requires javafx.controls;
	requires javafx.fxml;
	
	opens application to javafx.graphics, javafx.fxml;
}

O ERRO QUE APARECE ESTÁ A SEGUIR:

javafx.fxml.LoadException: 
/C:/ws-javaFX/javafx4/bin/gui/View.fxml:9

	at javafx.fxml/javafx.fxml.FXMLLoader.constructLoadException(FXMLLoader.java:2625)
	at javafx.fxml/javafx.fxml.FXMLLoader.access$700(FXMLLoader.java:105)
	at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:943)
	at javafx.fxml/javafx.fxml.FXMLLoader$InstanceDeclarationElement.processAttribute(FXMLLoader.java:980)
	at javafx.fxml/javafx.fxml.FXMLLoader$Element.processStartElement(FXMLLoader.java:227)
	at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processStartElement(FXMLLoader.java:752)
	at javafx.fxml/javafx.fxml.FXMLLoader.processStartElement(FXMLLoader.java:2722)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2552)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2466)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3237)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3194)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3163)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3136)
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:3113)
	at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:3106)
	at javafx1/application.Main.start(Main.java:15)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:391)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427)
	at javafx.graphics/com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96)
	at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at javafx.graphics/com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174)
	at java.base/java.lang.Thread.run(Thread.java:832)
Caused by: java.lang.IllegalAccessException: class javafx.fxml.FXMLLoader$ValueElement (in module javafx.fxml) cannot access class gui.ViewController (in module javafx1) because module javafx1 does not export gui to module javafx.fxml
	at java.base/jdk.internal.reflect.Reflection.newIllegalAccessException(Reflection.java:385)
	at java.base/java.lang.reflect.AccessibleObject.checkAccess(AccessibleObject.java:693)
	at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:490)
	at java.base/java.lang.reflect.ReflectAccess.newInstance(ReflectAccess.java:128)
	at java.base/jdk.internal.reflect.ReflectionFactory.newInstance(ReflectionFactory.java:350)
	at java.base/java.lang.Class.newInstance(Class.java:645)
	at javafx.fxml/javafx.fxml.FXMLLoader$ValueElement.processAttribute(FXMLLoader.java:936)
	... 22 more