SE PRODUJO UNA EXCEPCIÓN

Invalid value passed to append; please use appendMeta()
Pila de eventos:
#0 /var/www/www.soloporteros.com/library/Zend/View/Helper/HeadMeta.php(164): Zend_View_Helper_HeadMeta->append(Object(stdClass))
#1 /var/www/www.soloporteros.com/library/Motor/controllers/ProductosController.php(710): Zend_View_Helper_HeadMeta->__call('appendName', Array)
#2 /var/www/www.soloporteros.com/library/Motor/controllers/ProductosController.php(710): Zend_View_Helper_HeadMeta->appendName('keywords', NULL)
#3 /var/www/www.soloporteros.com/library/Zend/Controller/Action.php(516): Motor_ProductosController->indexAction()
#4 /var/www/www.soloporteros.com/library/Motor/Dispatcher.php(175): Zend_Controller_Action->dispatch('indexAction')
#5 /var/www/www.soloporteros.com/library/Zend/Controller/Front.php(954): Motor_Dispatcher->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#6 /var/www/www.soloporteros.com/library/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#7 /var/www/www.soloporteros.com/library/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#8 /var/www/www.soloporteros.com/public_html/index.php(74): Zend_Application->run()
#9 {main}