NativeUI Fehler - Lösungsvorschläge gesucht!

const misc = require('../cMisc');
const NativeUI = require('../nativeui');


const Menu = NativeUI.Menu;
const UIMenuItem = NativeUI.UIMenuItem;
const UIMenuListItem = NativeUI.UIMenuListItem;
const UIMenuCheckboxItem = NativeUI.UIMenuCheckboxItem;
const UIMenuSliderItem = NativeUI.UIMenuSliderItem;
const BadgeStyle = NativeUI.BadgeStyle;
const Point = NativeUI.Point;
const ItemsCollection = NativeUI.ItemsCollection;
const Color = NativeUI.Color;
const ListItem = NativeUI.ListItem;


mp.gui.cursor.visible = false;
mp.gui.chat.show(false);


mp.events.add({
	"cMenu-Open" : (lang, inject) => {
		misc.prepareToCef(1);
		misc.openCef("package://RP/Browsers/Menu/Menu.html", lang);
		misc.injectCef(inject);
	},
	"cXMenu-Open" : () => {


		if (ui.Visible) ui.Close();
		else ui.Open();


		const ui = new Menu("Test UI", "Test UI Subtitle", new Point(50, 50));
		ui.AddItem(new UIMenuListItem(
			"List Item",
			"Fugiat pariatur consectetur ex duis magna nostrud et dolor laboris est do pariatur amet sint.",
			new ItemsCollection(["Item 1", "Item 2", "Item 3"])
		));
		ui.AddItem(new UIMenuSliderItem(
			"Slider Item",
			["Fugiat", "pariatur", "consectetur", "ex", "duis", "magna", "nostrud", "et", "dolor", "laboris"],
			5,
			"Fugiat pariatur consectetur ex duis magna nostrud et dolor laboris est do pariatur amet sint.",
			true
		));
		ui.AddItem(new UIMenuCheckboxItem(
			"Checkbox Item",
			false,
			"Fugiat pariatur consectetur ex duis magna nostrud et dolor laboris est do pariatur amet sint."
		));


		ui.ItemSelect.on(item => {
			if (item instanceof UIMenuListItem) {
				console.log(item.SelectedItem.DisplayText, item.SelectedItem.Data);
			} else if (item instanceof UIMenuSliderItem) {
				console.log(item.Text, item.Index, item.IndexToItem(item.Index));
			} else {
				console.log(item.Text);
			}
		});
	},
});