Problème:Exception in Application start method

Bonjour a tout le monde, j'ai un problème a l'utilisation de JavaFX que je n'arrive pas a résoudre ... (je travaille sous netbeans 8.2)
J'ai créer un projet JavaFX avec plusieurs package :
"ch.makery.GPAO"
composé de " view" et de "model"
Dans ch.makery.GPAO.view j'ai deux fichier "ArticleOverview.fxml" et "RootLayout.fxml"
Dans ch.makery.GPAO j'ai ma classe principale "MainApp.java" dont voici le code :

Code:

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package ch.makery.GPAO;
 
import java.io.IOException;
 
import javafx.application.Application;
import javafx.fxml.FXMLLoader;
import javafx.scene.Scene;
import javafx.scene.layout.AnchorPane;
import javafx.scene.layout.BorderPane;
import javafx.stage.Stage;
 
public class MainApp extends Application {
 
    private Stage primaryStage;
    private BorderPane rootLayout;
 
    @Override
    public void start(Stage primaryStage) {
        this.primaryStage = primaryStage;
        this.primaryStage.setTitle("GPAO_App");
 
        initRootLayout();
 
        showArticleOverview();
    }
 
    /**
     * Initializes the root layout.
     */
    public void initRootLayout() {
        try {
            // Load root layout from fxml file.
            FXMLLoader loader = new FXMLLoader();
            loader.setLocation(MainApp.class.getResource("view/RootLayout.fxml"));
            rootLayout = (BorderPane) loader.load();
 
            // Show the scene containing the root layout.
            Scene scene = new Scene(rootLayout);
            primaryStage.setScene(scene);
            primaryStage.show();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    /**
     * Shows the person overview inside the root layout.
     */
    public void showArticleOverview() {
        try {
            // Load person overview.
            FXMLLoader loader = new FXMLLoader();
            loader.setLocation(MainApp.class.getResource("view/ArticleOverview.fxml"));
            AnchorPane ArticleOverview = (AnchorPane) loader.load();
 
            // Set article overview into the center of root layout.
            rootLayout.setCenter(ArticleOverview);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
 
    /**
     * Returns the main stage.
     * @return
     */
    public Stage getPrimaryStage() {
        return primaryStage;
    }
 
    public static void main(String[] args) {
        launch(args);
    }
}

A la compilation, j'obtient l'erreur suivante :

Code:

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Exception in Application start method
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 com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:389)
	at com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:328)
	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$FXHelper.main(LauncherHelper.java:767)
Caused by: java.lang.RuntimeException: Exception in Application start method
	at com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:917)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication$155(LauncherImpl.java:182)
	at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.ClassCastException: javafx.scene.layout.AnchorPane cannot be cast to javafx.scene.layout.BorderPane
	at ch.makery.GPAO.MainApp.initRootLayout(MainApp.java:36)
	at ch.makery.GPAO.MainApp.start(MainApp.java:23)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$162(LauncherImpl.java:863)
	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$175(PlatformImpl.java:326)
	at com.sun.javafx.application.PlatformImpl.lambda$null$173(PlatformImpl.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$174(PlatformImpl.java:294)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$148(WinApplication.java:191)
	... 1 more
Exception running application ch.makery.GPAO.MainApp
Java Result: 1
Deleting directory D:\Zeus\WinZeus\Documents\NetBeansProjects\JavaFX_GPAO\dist\run1056974998
jfxsa-run:
BUILD SUCCESSFUL (total time: 1 second)

Si vous pouviez m'aidez, je serais sauvé ...

Edit : C'est bon j'ai réussi ^^