Problem with 'Hello World'

[eluser]tomcode[/eluser]
Since CI 2.0, You need to extend CI_Controller instead of Controller

Code:

class Site extends CI_Controller
{
    function index()
    {
       echo "Hello World";
    }
}

edit: Use the user guide bundled with the distribution, a lot of tutorials available still refer to CI 1.* versions, CI 2.* has some fundamental changes