Phptheadmin not working in webmin

I had installed phpmyadmin in my Redhat Linux server machine (64bit). After installation when I tried to access the same with the URL domain.com/phpmyadmin, it is showing an error:

The requested URL /phpmyadmin/navigation.php< was not found on this server.

then I tried to access domain.com/phpmyadmin/setup, it is showing this error:

<?
/* @license http://www.gnu.org/licenses/gpl.html GNU GPL 2.0 */
/**
 * Core libraries.
 */
require './lib/common.inc.php';
$page = filter_input(INPUT_GET, 'page');
$page = preg_replace('/[^a-z]/', '', $page);
if ($page === '') { $page = 'index'; }
if (!file_exists("./setup/frames/$page.inc.php")) {
  // it will happen only when enterung URL by hand, we don't care for these cases
  die(__('Wrong GET file attribute value'));
}

// Handle done action info
$action_done = filter_input(INPUT_GET, 'action_done');
$action_done = preg_replace('/[^a-z_]/', '', $action_done);
// send no-cache headers
require './libraries/header_http.inc.php';
?>

and below this error only displaying "phpMyAdmin setup" and that's all. Also I had a try to access phpinfo.php in phpmyadmin folder and its showing a blank page.

Websites pages with PHP are working fine.