Problem using anchor tag (solved)

[eluser]stormlead[/eluser]
the anchor line is

Code:

echo  anchor('system/application/controllers/next.php','click here');

now as it was giving the link like
http://localhost/CodeIgniter_1.7.2/index...llers/next

i chaged the

Code:

$config[index_page]="index.php" to
$config[index_page]=""

so now the next.php which is controller is getting called but giving the error

Fatal error: Class 'Controller' not found in C:\wamp\www\CodeIgniter_1.7.2\system\application\controllers\next.php on line 3
my code for next.php is

Code:

<?php

class Next extends Controller {
function Next()
{
     parent::Controller();    
}
    
function index()
{
    $this->load->view('welcome_message');
    }

}

?>

plese help me out of this...