title: My website is throwing "PHP Fatal error: Call to undefined method CI_Lang::lang()"
body: <p>I created a website using CodeIgniter Framework 2.1.0 that was originally working well. Yesterday, I integrated <a href="http://codeigniter.com/wiki/CodeIgniter_2.1_internationalization_i18n" rel="nofollow">this i18n code</a> into the site for multi-language support. 
  Now, when I upload my site to cpanel and open it, I get this error in my log file:</p>
  
  <blockquote>
    <p>[21-Nov-2011 10:19:04] PHP Fatal error:  Call to undefined method CI_Lang::lang() in XXXX</p>
  </blockquote>
  
  <p>However, the website is working well on my localhost server (xampp for Windows). What's wrong?</p>