Datamanager + Cronjob?

[high76]

Hi, Im trying to add a thread via cronjob but always got an error:

PHP Fatal error:  Call to a member function on a non-object in /var/www/virtual/domain.com/htdocs/global.php on line 241, referer: http://domain.com/admincp/cronadmin.php?do=modify

calling this file manually it works perfect, the thread is generated. Anyone an idea whats causing the problem via cronjob?

<?php
  require_once('./global.php');
  require_once('./includes/class_dm.php');
  require_once('./includes/class_dm_threadpost.php');

$threaddm =& datamanager_init('Thread_FirstPost',$vbulletin,ERRTYPE_ARRAY,'threadpost');
    $allowsmilie = '1';
    $visible = '1';
    $pagetext = "test"; 
    $forumid = 1554;
    $bbuserid = 98372;
    $title = "Title";

// Insert thread
  $threaddm->set('title',$title);
  $threaddm->set('pagetext',$pagetext);
  $threaddm->set('forumid',$forumid);
  $threaddm->set('userid',$bbuserid);
  $threaddm->set('open',1);
  $threaddm->set('replycount',0);
  $threaddm->set('dateline',TIMENOW);
  $threaddm->set('views',0);
  $threaddm->set('visible',1);
  $threaddm->set('allowsmilie',1);
  $threaddm->set_info('forum',$newforuminfo);
  $threaddm->pre_save();
  if(!empty($threaddm->errors))
  {
   print_r($threaddm->errors);
   exit;
  }
  else
  {
   $newthreadid = $threaddm->save();
  } 

?>

[sebbe]

Try change this

$threaddm =& datamanager_init('Thread_FirstPost',$vbulletin,ERRTYPE_ARRAY,'threadpost'); 

to

$threaddm = new vB_DataManager_Thread_FirstPost($vbulletin, ERRTYPE_STANDARD);