Accordion Menu

Hello,
first i'm a new be!!!
i had a problem whith the accordion menu widget
i extract it in protected/extensions
i add it in the application configuration file (main.php) :

'components'=>array(....
                        ,'emenu'=>array(
                    			'class'=>'ext.emenu.EMenu',
			),

i call it in my view

$this->widget('ext.emenu.EMenu', array('items' => $emm));

but i got this error :

include(EMenu.php) [<a href='function.include'>function.include</a>]: failed to open stream: No such file or directory

?
thanks