Answered Modx how to change /manager/ to /admin/ url?

I've changed the paths in /core/config/config.inc.php:

if (!defined('MODX_MANAGER_PATH')) {
$modx_manager_path= '/var/www/mysite/data/www/mysite/admin/';
$modx_manager_url= '/admin/';
define('MODX_MANAGER_PATH', $modx_manager_path);
define('MODX_MANAGER_URL', $modx_manager_url);
}
but when I go to /admin/ - it gives me error 'mysite is currently unable to handle this request.'

the path /manager/ - collides with the ispmanager path....any help please