SDN'e girerken hata

[steinmetz]

Fatal error: Uncaught exception 'Zend_Session_Exception' with message 'session has already been started by session.auto-start or session_start()' in /storage/www/sdn/library/Zend/Session.php:427 Stack trace: #0 /storage/www/sdn/library/Zend/Session/Namespace.php(116): Zend_Session::start(true) #1 /storage/www/sdn/library/Zend/Auth/Storage/Session.php(87): Zend_Session_Namespace->__construct('Zend_Auth') #2 /storage/www/sdn/library/Zend/Auth.php(91): Zend_Auth_Storage_Session->__construct() #3 /storage/www/sdn/library/Zend/Auth.php(143): Zend_Auth->getStorage() #4 /storage/www/sdn/library/Cms/Controller/Action.php(71): Zend_Auth->getIdentity() #5 /storage/www/sdn/library/Cms/Controller/Action.php(27): Cms_Controller_Action->getUser() #6 /storage/www/sdn/library/Zend/Controller/Action.php(123): Cms_Controller_Action->init() #7 /storage/www/sdn/library/Zend/Controller/Dispatcher/Standard.php(261): Zend_Controller_Action->__construct(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http), Array) #8 /stora in /storage/www/sdn/library/Zend/Session.php on line 427

Siteye girerken bazen bu hata ile karşılaşıyorum. Başka bu sorunu gören varmı? Nedeni ne olabilir acaba?