title: Discord js Add reaction to a bot message
body: <p>I've been created my own discord bot but i have this error for this code: </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
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  <pre class="snippet-code-html lang-html prettyprint-override"><code>    message.channel.send(":apple:***SONDAGE :apple:\n "+choix1+" ou "+""+choix2+"***")
        .then(function (message) {
            message.react("")
            message.react("")
           message.pin()
            message.delete()
         });</code></pre>
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  <p>It's send a message to the channel and add reaction, and in my console i have this error: </p>
  
  <p><div class="snippet" data-lang="js" data-hide="false" data-console="true" data-babel="false">
  <div class="snippet-code">
  <pre class="snippet-code-html lang-html prettyprint-override"><code>(node:11728) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): DiscordAPIError: Unknown Message
  (node:11728) DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
  (node:11728) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 2): DiscordAPIError: Unknown Message</code></pre>
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