写真が正しく表示されないのは何故でしょうか･･･？

前提・実現したいこと

写真をラベルに貼り付けて表示したいのですが、どうしても以下のエラーが起きてしまいます。どなたか教えて頂くことは可能でしょうか？

発生している問題・エラーメッセージ

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$154(LauncherImpl.java:182)
	at java.lang.Thread.run(Thread.java:748)
Caused by: java.lang.NullPointerException
	at saisyuukadai.five.start(five.java:25)
	at com.sun.javafx.application.LauncherImpl.lambda$launchApplication1$161(LauncherImpl.java:863)
	at com.sun.javafx.application.PlatformImpl.lambda$runAndWait$174(PlatformImpl.java:326)
	at com.sun.javafx.application.PlatformImpl.lambda$null$172(PlatformImpl.java:295)
	at java.security.AccessController.doPrivileged(Native Method)
	at com.sun.javafx.application.PlatformImpl.lambda$runLater$173(PlatformImpl.java:294)
	at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:95)
	at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
	at com.sun.glass.ui.win.WinApplication.lambda$null$147(WinApplication.java:177)
	... 1 more
Exception running application saisyuukadai.five

該当のソースコード

javafx
1package saisyuukadai;
2
3import javafx.application.Application;
4import javafx.event.EventHandler;
5import javafx.scene.Scene;
6import javafx.scene.control.Button;
7import javafx.scene.control.Label;
8import javafx.scene.image.Image;
9import javafx.scene.image.ImageView;
10import javafx.scene.input.MouseEvent;
11import javafx.scene.layout.BorderPane;
12import javafx.scene.layout.HBox;
13import javafx.stage.Stage;
14
15public class five extends Application {
16	private Label lb1,lb2,lb3;
17	private Button bt1;
18	private Image im,im2;
19	public static void main(String[]args) {
20		launch(args);
21	}
22	public void start(Stage stage)throws Exception{
23
24		im = new Image(getClass().getResourceAsStream("sizue.jpeg"));
25		lb1.setGraphic(new ImageView(im));
26		im2 = new Image(getClass().getResourceAsStream("sizue.jpeg"));
27		lb2.setGraphic(new ImageView(im2));
28
29    	HBox hb = new HBox(10d);
30    	hb.getChildren().add(lb1);
31    	hb.getChildren().add(lb2);
32
33    	bt1 = new Button("回答");
34
35		BorderPane bp = new BorderPane();
36	    Scene sc = new Scene(bp,500,400);
37
38	    bp.setBottom(bt1);
39	    bp.setCenter(hb);
40	    bp.setTop(lb3);
41
42	    bt1.addEventHandler(MouseEvent.MOUSE_CLICKED, new SampleEventHandler());
43
44	        stage.setScene(sc);
45
46	        stage.setTitle("間違い探しゲーム");
47	        stage.show();
48	}
49	class SampleEventHandler implements EventHandler<MouseEvent>
50    {
51        public void handle(MouseEvent e)
52{
53            double x = e.getX();
54
55            double y = e.getY();
56
57        lb3.setText(" (" + x + "," + y + ")");
58}
59}
60}