title: Domain has already been taken
body: <p>I have an app on Heroku.
  I am trying to do the steps from <a href="https://devcenter.heroku.com/articles/custom-domains" rel="nofollow">this tutorial</a> so that my Application has a recognizable domain name. </p>
  
  <p>When I enter the following command (with my own domain) :<br/>
  <code>heroku domains:add www.example.com</code> <br/><br/></p>
  
  <p>I receive this error message :<br/></p>
  
  <pre><code>Adding www.example.com to fierce-escarpment-8305... failed&lt;br/&gt;
  
   !    Domain has already been taken
  </code></pre>
  
  <p>I don't understand what that means. I cancelled my account on my other hosting service so that I could free my domain name and I reseted my infos with my domain provider so that my domain points to a temp page. </p>
  
  <p>Ok ! So I now understand (I think) what I had to change on my domain provider site. I think my infos are now correct, because I don't have the  "!    Domain has already been taken" error message.<br/>
  Now, I have this message : <br/>
  »heroku domains:add www.math-moi.com<br/>
   !    No app specified.<br/>
   !    Run this command from an app folder or specify which app to use with --app <br/>
  » heroku domains:add www.math-moi.com --app heroku-fierce-escarpment-8305<br/>
  Adding www.math-moi.com to heroku-fierce-escarpment-8305... failed<br/>
   !    App not found<br/></p>
  
  <p>Can anyone tell me what I am doing wrong ? </p>
  
  <hr>
  
  <p>»heroku domains:add www.math-moi.com --app heroku-fierce-escarpment-8305.herokuapp.com<br/>
  Adding www.math-moi.com to heroku-fierce-escarpment-8305.herokuapp.com... failed<br/>
   !    Resource not found</p>
  
  <hr>
  
  <p>Still having the error message ... <br/></p>
  
  <pre><code>»heroku domains:add www.math-moi.com --app fierce-escarpment-8305&lt;br/&gt;
  Adding www.math-moi.com to fierce-escarpment-8305... failed&lt;br/&gt;
   !    Domain has already been taken
  </code></pre>