title: MySQL error when running `rails server`
body: <p>I get the following error when I run <code>rails server</code></p>
  
  <pre><code>Could not find mysql2-0.2.7 in any of the sources
  </code></pre>
  
  <p>Any ideas? How do i fix this?</p>
  
  <p>Thanks in advance ;-)</p>