Javascript - discord.js: 'ReferenceError: Message not defined'?

im gonna go to make an open ai discord bot but this is happen yesterday, i make open ai bot with SAME CODE like this but today it full with error someone pls help me

require('dotenv/config');
const{ Client } = require('discord.js');
const{ OpenAI } = require('openai');

const client = new Client({
    intents: [
        'Guilds', 
        'GuildMembers', 
        'GuildMessages', 
        'MessageContent'],
});

client.on('ready', () => {
    console.log('gpt READY!')
})

const IGNORE_PREFIX = "!";
const CHANNELS = ['1041682904729800829', '1042040860382089297'];

const openai = new OpenAI({
    apiKey: process.env.OPENAI_KEY,
})

client.on('messageCreate', async (message) => {
    if (message.author.bot) return;
    if (message.content.startsWith(IGNORE_PREFIX)) return;
    if (!CHANNELS.includes(message.channelId) && !message.mentions.users.has(client.user.id)) return;

    const response = await openai.chat.completions.create({
        model: 'gpt-3.5-turbo-16k-0613',
        messages: [
            {
                // name:
                role: 'system',
                content: 'Chat GPT is a friendly chatbot.'
            },
            {
                // name:
                role: 'user',
                content: messages.content,
            }
        ]
    }).catch((error) => console.error('OpenAI Error:\n',error));

    message.reply(response.choices[0].message.content);
});

client.login(process.env.TOKEN);

and this is happen

gpt READY!
node:events:496
      throw er; // Unhandled 'error' event
      ^

ReferenceError: messages is not defined
    at Client.<anonymous> (D:\---------\APP\gpt discord.js\index.js:41:26)

Node.js v20.11.1
[nodemon] app crashed - waiting for file changes before starting...

pls help me im a beginner javacript coder so pls help me i apreciate you if you help me