i have only this command


const { RichEmbed } = require('discord.js')
const sm = require('string-similarity');
module.exports = {
    config: {
        name: "avatar",
        aliases: ["avt"]
    }
},
run:  async (client, args, message) => {


  let members = [];
  let indexes = [];

  message.guild.members.forEach(function(member){
    members.push(member.user.username);
    indexes.push(member.id);
  })
  let match = sm.findBestMatch(args.join(' '), members);
  let username = match.bestMatch.target;
  let member = message.guild.members.get(indexes[members.indexOf(username)])
  let usernameUser = '';
  let UserMention = '';

  if(!args[0]) {
    usernameUser = message.author
    UserMention = message.member
  } else {
  let mention = message.mentions.users.first()
    usernameUser = mention || member.user
    UserMention = message.mentions.members.first() || message.guild.members.get(args[0]) || member
  }
 var  embed = new RichEmbed()
                        .setTitle(`${usernameUser.tag}'s avatar`)
                        .setColor('#36393e')
                        .setImage(usernameUser.displayAvatarURL)
                        .setURL(usernameUser.avatarURL)
                                    .setTimestamp()

            .setFooter(message.author.tag, message.author.avatarURL)
        message.channel.send(embed)
}
 Error :
/home/ubuntu/workspace/handlers/command.js:9
            client.commands.set(pull.config.name, pull);
                                            ^

TypeError: Cannot read property 'name' of undefined
    at load (/home/ubuntu/workspace/handlers/command.js:9:45)
    at forEach.x (/home/ubuntu/workspace/handlers/command.js:13:42)
    at Array.forEach (<anonymous>)
    at module.exports (/home/ubuntu/workspace/handlers/command.js:13:29)
    at forEach.x (/home/ubuntu/workspace/bot.js:4:72)
    at Array.forEach (<anonymous>)
    at Object.<anonymous> (/home/ubuntu/workspace/bot.js:4:33)
    at Module._compile (internal/modules/cjs/loader.js:689:30)
    at Object.Module._extensions..js (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)