TypeError: n is null about talkjs-examples HOT 8 CLOSED

import { useEffect } from 'react';
import Talk from "talkjs";

const ChatBox = () => {
    useEffect(() => {
        Talk.ready.then(() => {
            // After `Talk.ready`
            const currentUser = new Talk.User({
                id: '156',
                name: 'Henry Msssill',
                email: '[email protected]',
                photoUrl: 'henry.jpeg',
                welcomeMessage: 'Hello!',
                role: 'default',
            });

            const otherUser = new Talk.User({
                id: 's2',
                name: 'Jessicssa Wells',
                email: '[email protected]',
                photoUrl: 'jessica.jpeg',
                welcomeMessage: 'Hello!',
                role: 'default',
            });

            const session = new Talk.Session({
                appId: 'ID',
                me: currentUser,
            });

            const conversationID = Talk.oneOnOneId(currentUser, otherUser);
            const conversation = session.getOrCreateConversation(conversationID);
            conversation.setParticipant(currentUser);
            conversation.setParticipant(otherUser);

            const chatbox = session.createChatbox();
            chatbox.select(conversation);
            chatbox.mount(document.getElementById('talkjs-container'));
        });
    }, []);

  return (
    <div id='talkjs-container' className='fixed bottom-4 right-4 h-96 z-[999]'>
    </div>
  )
}

export default ChatBox

const LandingPage: NextPage = () => {
    return (
        <>
            <ChatBox />
            <div>
                <Header />
                
                <main>
                    {/* ... */ }
                </main>

                <Footer />
            </div>
        </>
    )
}

export default LandingPage