[fw-mvc] zend_cache problem....

i wrote this code ....

index.php

/*
* caching stuff ...
*/
$frontend = array (lifetime => 1, automatic_seralization => false );
$backend = array ('cache_dir' => APPLICATION_PATH . '/cache/data/' );
$cache = Zend_Cache::factory('Core','File',$frontend,$backend);
Zend_Registry::set ( 'cache', $cache );
//end cache

in controller file

$sina = array('1','2');
serialize($sina);
$this->cache->automatic_serialization = true;
$this->cache->save($sina,'users');

but it throws this exception

Exception information:

Message:Datas must be string or set automatic_serialization = true

why?

--
________________
Sincerely
Sina Miandashti
MuSicBasE.ir & InvisionPower.ir Admin