Question about setControllerDirectory

Well, I wanted to separate the administration controllers from the main site
logical code. This is my first time doing it and thought I would give it a
try for the sake of not overcomplicating my life.

Here's the code

<?php
/** 
  * CMS Skeleton
  * 
  * #@author: David Gonzalez
  */ 
  
error_reporting(E_ALL|E_STRICT);

ini_set('display_startup_errors', 1);
ini_set('display_errors',1);

set_include_path('./library' . PATH_SEPARATOR . get_include_path());

require_once 'Zend/Loader.php';

Zend_Loader::registerAutoload();


$frontier = Zend_Controller_Front::getInstance(); 
$frontier->throwExceptions(1);

$frontier->setControllerDirectory(
  array('ImageHost' => 'application/CMS/controllers',
        'ImageHostAdmin' => 'application/CMSAdmin/controllers')
        ); 
        
var_dump($frontier->getModuleControllerDirectoryName());

$frontier->dispatch();

?>


Can someone explain why ZF is throwing this message at me? 

Fatal error: Uncaught exception 'Zend_Controller_Exception' with message 'No
default module defined for this application' in
C:\WebServer\Apache2\htdocs\CMS\library\Zend\Controller\Dispatcher\Standard.php:392
Stack trace: #0
C:\WebServer\Apache2\htdocs\CMS\library\Zend\Controller\Dispatcher\Standard.php(211):
Zend_Controller_Dispatcher_Standard->getControllerClass(Object(Zend_Controller_Request_Http))
#1
C:\WebServer\Apache2\htdocs\CMS\library\Zend\Controller\Dispatcher\Standard.php(245):
Zend_Controller_Dispatcher_Standard->isDispatchable(Object(Zend_Controller_Request_Http))
#2 C:\WebServer\Apache2\htdocs\CMS\library\Zend\Controller\Front.php(914):
Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http),
Object(Zend_Controller_Response_Http)) #3
C:\WebServer\Apache2\htdocs\CMS\index.php(29):
Zend_Controller_Front->dispatch() #4 {main} thrown in
C:\WebServer\Apache2\htdocs\CMS\library\Zend\Controller\Dispatcher\Standard.php
on line 392

I checked the API Doc and the documentation but I didn't quite find a real
answer to this, hope someone could explain this to me, I'd really appreciate
it. I want to continue learning ZF.

Thanks,
David
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