[kronolith] Unable to load the definition of Kronolith_Driver_

[Kevin]

im using the head tag from cvs.  ive deleted the conf.php and recreated 
it through the horde admin page but i still get the same error.

this is from conf.php:
$conf['calendar']['params']['table'] = 'kronolith_events';
$conf['calendar']['params']['driverconfig'] = 'horde';
$conf['calendar']['driver'] = 'sql';


i get the following error when i try to access kronolith:
Unable to load the definition of Kronolith_Driver_.

[line 326 of 
/opt/www/mail.redefine.org/public_html/horde/kronolith/lib/Driver.php]

heres the function its failing on:

     function &factory($driver = null, $params = null)
     {
         if (is_null($driver)) {
             $driver = $GLOBALS['conf']['calendar']['driver'];
         }
         $driver = basename($driver);

         if (is_null($params)) {
             $params = Horde::getDriverConfig('calendar', $driver);
         }

         include_once dirname(__FILE__) . '/Driver/' . $driver . '.php';
         $class = 'Kronolith_Driver_' . $driver;
         if (class_exists($class)) {
             return $driver = &new $class($params);
         } else {
             Horde::fatal(PEAR::raiseError(sprintf(_("Unable to load the 
definition of %s."), $class)), __FILE__, __LINE__);
         }
     }


it works fine if i manually set $driver = 'sql' before the basename. 
any ideas?