title: add a role to a user discord.js
body: <p>I am trying to make a command that gives a role to a member after I type power. I already have a mute command, and that one works completely fine, But if I copy that code and change the name of the command and the role it has to give, it gives the error:</p>
  <blockquote>
  <p>TypeError: Cannot read property of 'roles' of undefined</p>
  </blockquote>
  <p>my code is:</p>
  <pre><code>if(message.content.startsWith(&quot;power&quot;)) {
      let role =  message.guild.roles.cache.find(r =&gt; === &quot;Role_ID&quot;);
      let member = message.mentions.members.first();
      member.roles.add(role)
    }
  </code></pre>