title: Updating Composer- Error: There are no commands defined in the C namespace
body: <p>I was trying to update my composer through terminal after receiving notification that it's too old using this code <code>C:\ProgramData\Composer\bin\composer.phar self-update</code>
  and i get this error </p>
  
  <blockquote>
    <p>[InvalidArgumentException]
    There are no commands defined in the "C" namespace</p>
  </blockquote>
  
  <p>What is wrong here?</p>