ayuda con Zend_Auth

[RIVERMILLOS]

Listo ya pude me sale el siguiete error..

Código:

An error occurred
Application error
Exception information:

Message: No database adapter present
Stack trace:

#0 C:\xampp\php\PEAR\Zend\Auth\Adapter\DbTable.php(131): Zend_Auth_Adapter_DbTable->_setDbAdapter(NULL)
#1 C:\xampp\htdocs\Login\application\controllers\AuthenticationController.php(42): Zend_Auth_Adapter_DbTable->__construct(NULL)
#2 C:\xampp\htdocs\Login\application\controllers\AuthenticationController.php(18): AuthenticationController->getAuthAdapter()
#3 C:\xampp\php\PEAR\Zend\Controller\Action.php(513): AuthenticationController->loginAction()
#4 C:\xampp\php\PEAR\Zend\Controller\Dispatcher\Standard.php(295): Zend_Controller_Action->dispatch('loginAction')
#5 C:\xampp\php\PEAR\Zend\Controller\Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#6 C:\xampp\php\PEAR\Zend\Application\Bootstrap\Bootstrap.php(97): Zend_Controller_Front->dispatch()
#7 C:\xampp\php\PEAR\Zend\Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#8 C:\xampp\htdocs\Login\public\index.php(27): Zend_Application->run()
#9 {main}  

Request Parameters:

array (
  'controller' => 'authentication',
  'action' => 'login',
  'module' => 'default',
)

saludos