An exception occured while bootstrapping the application.

Invalid value passed to prepend; please use prependMeta()
Stack Trace:
#0 /var/www/web1/library/Zend/View/Helper/HeadMeta.php(158): Zend_View_Helper_HeadMeta->prepend(Object(stdClass))
#1 /var/www/web1/application/default/controllers/MediaCenterController.php(202): Zend_View_Helper_HeadMeta->__call('prependName', Array)
#2 /var/www/web1/application/default/controllers/MediaCenterController.php(202): Zend_View_Helper_HeadMeta->prependName('keywords', NULL)
#3 /var/www/web1/library/Zend/Controller/Action.php(513): MediaCenterController->news2Action()
#4 /var/www/web1/library/Zend/Controller/Dispatcher/Standard.php(295): Zend_Controller_Action->dispatch('news2Action')
#5 /var/www/web1/library/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#6 /var/www/web1/application/bootstrap.php(138): Zend_Controller_Front->dispatch()
#7 /var/www/web1/web/index.php(14): Bootstrap->runApp()
#8 {main}