BrainCMS Online Counter Error

[uttmmmm5]

Hey guys,
My onlinecounter at the client and the homepage show up this message (Error) :

You must be registered for see links

Not permanently but a few times per day.

Now my question: Is this dangerous ? Can someone "hack" me when he see this message ?
And how I can fix it ?

 

[MasterJiq]

View Source then paste the error message. I can't read the error lol

 

[Berk]

Just copy and paste the error we cannot read it.

 

[uttmmmm5]

This isn't really an error because the console don't show anything.
But the online counter at the client is not very important - i can disable it.
But this message is popup a few times on the homepage but only for 2 seconds and then the onlinecounter works perfect.
"Notice: session.start() : error at line 9 in global.php"

This is the global.php

<?php
if(!defined('BRAIN_CMS'))
    {
        die('Sorry but you cannot access this file!');
    }
    session_start();
    ob_start();
    define('Z', $_SERVER['DOCUMENT_ROOT'].'/');
    define('A', Z . 'system/');
    define('B', 'app/');
    define('C', 'classes/');
    define('E', 'languages/');
    define('G', 'content/');
    define('H', 'templates/');
    define('I', 'maintenance/');
    define('J', Z . 'adminpan/');
    define('K', 'plugins/');
    require_once A . '/brain-config.php';
    require_once A . E . '/'.$config['lang'].'.php';
    require_once A . B . C . '/functions.php';
    require_once A . B . C . '/class.game.php';
    require_once A . B . C . '/class.user.php';
    require_once A . B . C . '/class.html.php';
    require_once A . B . C . '/class.admin.php';
    require_once A . B . C . '/class.db.php';
    define('S', $config['skin']);
    Html::loadPlugins();