我刚刚开始学习，这是我尝试启动机器人时遇到的错误。 关于如何解决此问题的任何想法？

SyntaxError是：

    SyntaxError: C:\Users\Thela\code\config.json: Unexpected end of JSON input
        at JSON.parse (<anonymous>)
        at Object.Module._extensions..json (internal/modules/cjs/loader.js:987:27)
        at Module.load (internal/modules/cjs/loader.js:812:32)
        at Function.Module._load (internal/modules/cjs/loader.js:724:14)
        at Module.require (internal/modules/cjs/loader.js:849:19)
        at require (internal/modules/cjs/helpers.js:74:18)
        at Object.<anonymous> (C:\Users\Thela\code\index.js:2:16)
        at Module._compile (internal/modules/cjs/loader.js:956:30)
        at Object.Module._extensions..js (internal/modules/cjs/loader.js:973:10)
        at Module.load (internal/modules/cjs/loader.js:812:32)

index.js

    const Discord = require('discord.js');
    const config = require('./config.json');
    const client = new Discord.Client();

    client.once('ready',() => {
        console.log('Ready!');
    });

    client.on('message',message => {
        if (message.content === '!ping') {
            message.channel.send('Pong.');
        }
    });

    client.login(config.token);
    enter code here

并且config.json是

    {
        "prefix": "!","token": "<my-token>",}