Fixed some errors

+config.json
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 const { Client, Intents } = require('discord.js');
 const { Client, Intents } = require('discord.js');
+const { token } = require('./config.json');
 
 
-const client = new Client({ intents: [Intents.FLAGS.GUILDS] });
+const client = new Client({ intents: [Intents.FLAGS.GUILDS, Intents.FLAGS.GUILD_MESSAGES] });
 
 
-client.on('ready', () => {
+client.once('ready', () => {
     console.log(`Logged in as ${client.user.tag}!`);
     console.log(`Logged in as ${client.user.tag}!`);
 });
 });
 
 
-client.on('message', msg => {
+client.on('messageCreate', msg => {
     if (msg.content === 'ping') {
     if (msg.content === 'ping') {
         msg.reply('Pong!');
         msg.reply('Pong!');
     }
     }
 });
 });
 
 
-client.login('token');
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+client.login(token);
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