title: Cannot read property 'roles' of undefined Discord.js
body: <p>I have an issue with my discord bot which will be a board game bot (I hope). So, I try to assign to users their player number with roles like the first player will have the role 'Player 1' etc... But I always have the same issue:</p>
  
  <pre><code>let role = message.guild.roles.find("480091776468647936");
                           ^
  </code></pre>
  
  <blockquote>
    <p>TypeError: Cannot read property 'roles' of undefined
        at Client. (C:\Users\alant\Desktop\Informatique - Développement\Shadow Bot\shadow_bot.js:54:32)<br>
        at emitOne (events.js:121:20)<br>
        at Client.emit (events.js:211:7)<br>
        at MessageCreateHandler.handle (C:\node_modules\discord.js\src\client\websocket\packets\handlers\MessageCreate.js:9:34)<br>
        at WebSocketPacketManager.handle (C:\node_modules\discord.js\src\client\websocket\packets\WebSocketPacketManager.js:103:65)<br>
        at WebSocketConnection.onPacket (C:\node_modules\discord.js\src\client\websocket\WebSocketConnection.js:330:35)<br>
        at WebSocketConnection.onMessage (C:\node_modules\discord.js\src\client\websocket\WebSocketConnection.js:293:17)<br>
        at WebSocket.onMessage (C:\node_modules\ws\lib\EventTarget.js:99:16)<br>
        at emitOne (events.js:116:13)<br>
        at WebSocket.emit (events.js:211:7)</p>
  </blockquote>
  
  <p>I already tried so search on Google by myself, but I'm making this bot as a hobby and don't have (yet) a deep knowledge on JavaScript so I expect some help. (Sorry if my English is bad, I'm not from an English speaking country)</p>
  
  <pre class="lang-javascript prettyprint-override"><code>bot.on('message', function(message) {
      var message = message.content;
      if (message === "joueur  1") {
          membre = message.author;
          let role = message.guild.role.find("480091776468647936");
          membre.addRole(role);
          message.channel.send("Vous etas doreavant le joueur 1 ! ")
      }
  })
  </code></pre>