Show Last Post - Error

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Hi Guys

I Was Created a .php file for show Last Post .
at first Line include ( 'global.php')

It working Fine For Logged in users.
But Guests Get This message :

Unable to add cookies, header already sent.
File: /home/user/last_posts_show.php
Line: 1

How Can i Resolve this error ? :surprised:

I Need Help !

[Steve123]

you might want to post your script..

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You can see it Here :

PHP Code:

require_once('./global.php');
echo"<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\">";
$f_url = "."; // Change this to reflect to your forum's URL.
$f_id = ""; // If you wish to display the posts from a specific forum, enter the forum id here. Otherwise, leave it blank.
$limit = "20"; // Number of posts displayed.
$tcolor = "#006600"; // This is the color of the title.
$postedcolor = "#CC3300"; // This is the color of the bottom text.
$txtlimit = "100"; // This is the character limit.
echo"<marquee onmouseover=this.stop() onmouseout=this.start() dir=\"rtl\" direction=\"up\" scrollAmount=\"2\" scrolldelay=\"50\">";
echo "<table dir=\"rtl\" border=\"0\" width=\"100%\" cellspacing=\"0\" cellpadding=\"2\">";
if ($f_id) {
    $forumid = "AND forumid=$f_id";
}
if ($limit) {
    $limited = "LIMIT $limit";
}
$t_sql = mysql_query("SELECT threadid,title,lastpost,lastposter,forumid,postusername FROM " . TABLE_PREFIX . "thread WHERE visible=1 AND open=1 $forumid ORDER BY lastpost DESC $limited");

while($t_get=mysql_fetch_array($t_sql))
{
$lp = $t_get['lastpost'];
$p = $t_get['lastposter'];
$tid = $t_get['threadid'];
$fid = $t_get['forumid'];
$pun = $t_get['postusername'];
$f_sql = mysql_query("SELECT title FROM " . TABLE_PREFIX . "forum WHERE forumid=$fid");
$getf = mysql_fetch_array($f_sql);
$ftitle = $getf['title'];
$postsql = mysql_query("SELECT postid FROM " . TABLE_PREFIX . "post WHERE threadid=$tid");
$getpost = mysql_fetch_array($postsql);
$pid = $getpost['postid'];
$d = date ("m/d/y h:i A" ,$lp);
$t = $t_get['title'];
$t = substr($t,0,$txtlimit);
echo "<tr dir=\"rtl\"><td dir=\"rtl\"><font size=\"2\" face=\"utf-8\"><a target=_blank href=\"$f_url/showthread.php?p=$pid#post$pid\"><FONT SIZE=\"4\" COLOR=\"$tcolor\" face=\"tahoma\">$t</FONT></a></font><br> <font color=\"$postedcolor\" face=\"tahoma\" size='2'>نویسنده :  $p | انجمن :  $ftitle | شروع کننده موضوع: $pun</FONT></td></tr>";
}
echo "</table>";
echo"</marquee>";
?> 

I think a file must be include for check users cookie by Vbulletin .:hurt: