Problem with session, include (global.php ./) page no vb

[pablodip]

Hello people vbulletin, well the problem arises is in an external product vbulletin is a simple index.php where I am doing a "portal" which includes system login. The logeo works fine, but when I add

<?php
chdir('/home/mundoma1/public_html/foro');
require('./global.php');
chdir("../");

$vboptions['homeurl'] = $vbulletin->options['homeurl'];
$vboptions['bburl'] = $vbulletin->options['bburl'];
$vboptions['bbtitle'] = $vbulletin->options['bbtitle'];
$vboptions['forumhome'] = $vbulletin->options['forumhome'];
$vboptions['contactuslink'] = $vbulletin->options['contactuslink'];
$bbuserinfo['userid'] = $vbulletin->userinfo['userid'];
$bbuserinfo['usergroupid'] = $vbulletin->userinfo['usergroupid'];
$bbuserinfo['username'] = $vbulletin->userinfo['username'];
$bbuserinfo['email'] = $vbulletin->userinfo['email'];
$session['sessionurl'] = $vbulletin->session->vars['sessionurl'];
$session['sessionhash'] = $vbulletin->session->vars['sessionhash'];
?>

I receive the following message

Unable to add cookies, header already sent.
File: /home/mundoma1/public_html/foro/portalprobar.php
Line: 1

Search within the forum and gave all that had spaces before "<? Php" but then I realized that's not the problem, the problem is in the permissions because if start session with any account shows me the page and php saying "welcome user ..." but if I go away my message said.

my english is bad