help help script upload di server bermasalah

November 18, 2009 by bella

hey guys kenapa script upload gw di server bermasalah ya

code gw:
$config['upload_path'] = 'upload';
$config['allowed_types'] = 'pdf|jpeg|jpg';
$config['file_name'] = $data;
$config['max_size'] = '1000000';

$this->load->library('upload', $config);

if(!$this->upload->do_upload()){
$this->warning();
}else {
redirect('site/document');
}

error nya gini bro:
------------------------------------------------------------------------------------------------------------------------------------------
A PHP Error was encountered

Severity: Notice

Message: Undefined property: site::$upload

Filename: controllers/site.php

Line Number: 89

Fatal error: Call to a member function do_upload() on a non-object in ?????l/myweb/application/controllers/site.php on line 89
------------------------------------------------------------------------------------------------------------------------------------------

pdhal dipc gw dengan os windows itu tidak ada masalah, nah pas gw masukin server function upload error.

help me ok?
gw butuh pertolongan banget