title: GitHub "fatal: remote origin already exists"
body: <p>I am trying to follow along <a href="http://ruby.railstutorial.org/chapters/beginning#fnref:1.16" rel="noreferrer">Michael Hartl's Rails tutorial</a> but I've run across an error. </p>
  
  <p>I signed up on Github and issued a new SSH key and made a new repository. But when I enter the next line into the terminal I get the following error:</p>
  
  <pre><code>Parkers-MacBook-Pro:.ssh ppreyer$ git remote add origin git@github.com:ppreyer/first_app.git
  fatal: remote origin already exists.
  </code></pre>
  
  <p>Just wondered if anybody else has run across this problem?</p>