Wrong BoxLayout constraints without constraints

Code:

public class OptionsAudioContainer extends Container {
    private final float audPanelWidth, audPanelHeight;
    private VersionedReference<Boolean> isSoundMuted;

    public OptionsAudioContainer(Camera cam) {
        this.audPanelWidth = cam.getWidth();
        this.audPanelHeight = cam.getHeight();

        setLayout(new BorderLayout());
        setLocalTranslation(0, audPanelHeight, 0);
        setPreferredSize(new Vector3f(audPanelWidth, audPanelHeight, 0));
        setAlpha(0, false);

        Panel leftPane = new Panel() {{
            setLayout(new BorderLayout());
            setPreferredSize(new Vector3f(cam.getWidth() * .23f, audPanelHeight, 0));
            setAlpha(0, false);

            Label chapterLabel = new Label("Настройки звука");

            addChild(chapterLabel, BorderLayout.Position.North);
        }};

        Panel contentPane = new Panel() {{
            setLayout(new BoxLayout(Axis.Y, FillMode.None));
            setAlpha(0, false);

            Checkbox soundMutedChk = new Checkbox("Mute sound");
            soundMutedChk.setChecked(true);
            isSoundMuted = soundMutedChk.getModel().createReference();

            addChild(soundMutedChk);
        }};

        addChild(leftPane, BorderLayout.Position.West);
        addChild(contentPane, BorderLayout.Position.Center);
    }
}

got error:

11.10.24 19:00:02.139 [INFO] th:AWT-EventQueue-0 g.f.g.s.g.LemurUiState.showAudioOptionsMenu():67   Отображение настроек звука...
Exception in thread "AWT-EventQueue-0" java.lang.IllegalArgumentException: Box layout does not take constraints.
	at com.simsilica.lemur.component.BoxLayout.addChild(BoxLayout.java:241)
	at com.simsilica.lemur.Container.addChild(Container.java:112)
	at game.freya.gui.states.global.panes.options.OptionsAudioContainer.<init>(OptionsAudioContainer.java:53)
	at game.freya.gui.states.global.LemurUiState.showAudioOptionsMenu(LemurUiState.java:68)
	at game.freya.gui.states.global.OptionsState.lambda$showOptionsMenu$3(OptionsState.java:250)
	at java.desktop/java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:318)
	at java.desktop/java.awt.EventQueue.dispatchEventImpl(EventQueue.java:773)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:720)
	at java.desktop/java.awt.EventQueue$4.run(EventQueue.java:714)
	at java.base/java.security.AccessController.doPrivileged(AccessController.java:400)
	at java.base/java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:87)
	at java.desktop/java.awt.EventQueue.dispatchEvent(EventQueue.java:742)
	at java.desktop/java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:203)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:124)
	at java.desktop/java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:113)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:109)
	at java.desktop/java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
	at java.desktop/java.awt.EventDispatchThread.run(EventDispatchThread.java:90)

on the line “addChild(leftPane, BorderLayout.Position.West);”

BoxLayout does not take constraints. You are passing a BORDER LAYOUT constraint.

Did you mean to use BorderLayout instead of BoxLayout?