administrator permissions - cannot go into
 

Hi,
I cannot go into administrator permissions, there shows up the error:

Quote:
Sorry, you are not allowed to edit administrator permissions.

If you think you should have permission to access this page, you will need to edit the $config['SpecialUsers']['superadministrators'] variable in the includes/config.php file.

To allow the administrators to access this page, edit the variable to include the user IDs of those administrators should have access, separating each user ID with a comma, like this:

$config['SpecialUsers']['superadministrators'] = '1,25,57';

To allow only a single administrator to access this page, simply add that user's ID with no commas, like this:

$config['SpecialUsers']['superadministrators'] = '1';

I went to includes/config.php and added this phrase (with the correct id) Quote:
$config['SpecialUsers']['superadministrators'] = '1,25,57';

but nothing has changed. I probably did it wrongly. Could you help me?