When I try running my WhatsApp Bots using whatsapp-web.js module and making if Admins using a .setSMAO (Send Messages Admin Only) true, it will automatically set the Group Settings Send Messages to Admin Only

I search the methods on https://docs.wwebjs.dev/GroupChat.html and found GroupChat.setMessagesAdminsOnly();

I tried adding it and then test it but instead of working, I just met this error

GroupChat.setMessagesAdminsOnly();
          ^

TypeError: GroupChat.setMessagesAdminsOnly is not a function
    at Client.<anonymous> (D:\WhatsApp Bots keenan\bot.js:240:14)
    at runMicrotasks (<anonymous>)
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

The code:

client.on('message', async msg => {
    const chat = await msg.getChat();
    const contact = await msg.getContact();

    if (msg.body == '.setSMAO true') {
        if (chat.isGroup) {
            let chat = await msg.getChat();
            GroupChat.setMessagesAdminsOnly();
            msg.reply('Successfully changed the Group Settings.');
            console.log('[CHANGED_SEND_MESSAGE_TO_ADMIN_ONLY] There was an Admin that changed the Group Settings Send Message to Admin Only');
        } else {
            msg.reply('This command only works on Group or the Bot didn't have an Admin Permissions!');
        }
    } 
});

What did I do? Did I just typing it wrong?