You don't have permission to access /CodeIgniter/application/controllers

[eluser]CroNiX[/eluser]
It looks like you tried to access your controller directly in the url, like http://yoursite.com/Codeigniter/applicat...llers/site, which you can't do and is not how CI works with URLs.

You would use:
http://yoursite.com/index.php/site
or
http://yoursite.com/site if you use the htaccess rules for making CI work without index.php in the url