Problème : Erreur JavaFx

Salut tout le monde, ce code est issu d'un cours Java, les chemins pour les fichiers FXML sont correctes, mais je reçois toujours cette erreur.

Code:

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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 MainClass extends Application {
 
	private Stage stagePrincipal;
	private BorderPane conteneurPrincipal;
 
	@Override
	public void start(Stage primaryStage) {
		stagePrincipal = primaryStage;
		stagePrincipal.setTitle("Application de gestion de personnes");
 
		initialisationConteneurPrincipal();
		initialisationContenu();
	}
 
	private void initialisationConteneurPrincipal() {
 
		FXMLLoader loader = new FXMLLoader();
 
		loader.setLocation(MainClass.class.getResource("person/Two.fxml"));
		try {
 
			conteneurPrincipal = (BorderPane) loader.load();
 
			Scene scene = new Scene(conteneurPrincipal);
 
			stagePrincipal.setScene(scene);
 
			stagePrincipal.show();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	private void initialisationContenu() {
		FXMLLoader loader = new FXMLLoader();
		loader.setLocation(MainClass.class.getResource("person/One.fxml"));
		try {
 
			AnchorPane conteneurPersonne = (AnchorPane) loader.load();
 
			conteneurPrincipal.setCenter(conteneurPersonne);
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
 
	public static void main(String[] args) {
		launch(args);
	}
}

Erreur :

Code:

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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:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplicationWithArgs(LauncherImpl.java:464)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication(LauncherImpl.java:363)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:566)
	at java.base/sun.launcher.LauncherHelper$FXHelper.main(LauncherHelper.java:1051)
Caused by: java.lang.RuntimeException: Exception in Application start method
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.launchApplication1(LauncherImpl.java:900)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$launchApplication$2(LauncherImpl.java:195)
	at java.base/java.lang.Thread.run(Thread.java:834)
Caused by: java.lang.IllegalStateException: Location is not set.
	at javafx.fxml/javafx.fxml.FXMLLoader.loadImpl(FXMLLoader.java:2459)
	at javafx.fxml/javafx.fxml.FXMLLoader.load(FXMLLoader.java:2435)
	at person.MainClass.initialisationConteneurPrincipal(MainClass.java:102)
	at person.MainClass.start(MainClass.java:91)
	at javafx.graphics/com.sun.javafx.application.LauncherImpl.lambda$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$10(PlatformImpl.java:428)
	at java.base/java.security.AccessController.doPrivileged(Native Method)
	at javafx.graphics/com.sun.javafx.application.PlatformImpl.lambda$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)
	... 1 more
Exception running application person.MainClass