Error mesages

drupal_set_message

http://api.drupal.org/api/drupal/includes%21bootstrap.inc/function/drupal_set_message/7

/var/www/rue89v2/dev/includes/file.inc:886:

drupal_set_message(t('The specified file %file could not be copied, because the destination directory is not properly configured. This may be caused by a problem with file or directory permissions. More information is available in the system log.', array('%file' => $original_source)), 'error');

The token remplacement is a functionality of t() function