dbutil not working for me

Does anyone use the dbutil() class?  If so are you having any problems?

I have tried a very simple example.  The database driver is loaded.

$this->load->dbutil();

$dbs = $this->dbutil->list_databases();

I get the following errror when running any function listed in the documentation.

Severity: Notice
Message: Undefined property: CI_Loader::$dbutil
Filename: views/welcome_message.php
Line Number: 4

Everything else seems to work fine.