Tiny error, need urgent fix :D

[Mijae]

I currently have

<?php 
error_reporting(7); 
require('http://xxx/forum/global.php'); 

$numbersmembers=$DB_site->query_first('SELECT COUNT(*) AS users,MAX(userid) AS max FROM user'); 
$numbermembers=number_format($numbersmembers['users']); 

// get total posts 
$countposts=$DB_site->query_first('SELECT COUNT(*) AS posts FROM post'); 
$totalposts=number_format($countposts['posts']); 

$countthreads=$DB_site->query_first('SELECT COUNT(*) AS threads FROM thread'); 
$totalthreads=number_format($countthreads['threads']);
?>

And I get this:

Fatal error: Call to a member function on a non-object in /home/xxx/public_html/test.php on line 5

How can I make it work? Without using templates

Please someone help, it used to be so easy with vB2, and now I cant make it work.