php - upload image not move in foler -

i have trouble website

when upload image website , image success database cannot moved image folder

$config = array(  'allowed_types'=>'jpg|jpeg|gif|png|bmp',  'upload_path'=>base_url().'webroot/img/barang',  'max_size'=>'5000' ); 

just after upload, this:

print_r($this->upload->data());

this show data have after upload process has completed. if see nothing wrong in there, possibly @amithorakeri said in comments above: permissions.

hope helps.