Unable to read response, or response is empty

#0 /var/www/magento/lib/Redarea/Utility/JsonRpcClient.php(77): Zend_Http_Client->request()
#1 /var/www/magento/app/code/local/Rikorda/Core/Model/Observer.php(57): Redarea_Utility_JsonRpcClient->sendRequest('Account.getGues...', Array)
#2 /var/www/magento/app/code/core/Mage/Core/Model/App.php(1338): Rikorda_Core_Model_Observer->routeStartup(Object(Varien_Event_Observer))
#3 /var/www/magento/app/code/core/Mage/Core/Model/App.php(1317): Mage_Core_Model_App->_callObserverMethod(Object(Rikorda_Core_Model_Observer), 'routeStartup', Object(Varien_Event_Observer))
#4 /var/www/magento/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('controller_acti...', Array)
#5 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(527): Mage::dispatchEvent('controller_acti...', Array)
#6 /var/www/magento/app/code/core/Mage/Core/Controller/Front/Action.php(64): Mage_Core_Controller_Varien_Action->preDispatch()
#7 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Action.php(407): Mage_Core_Controller_Front_Action->preDispatch()
#8 /var/www/magento/app/code/local/Rikorda/Core/Controller/Router.php(137): Mage_Core_Controller_Varien_Action->dispatch('puntivendita')
#9 /var/www/magento/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Rikorda_Core_Controller_Router->match(Object(Mage_Core_Controller_Request_Http))
#10 /var/www/magento/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front->dispatch()
#11 /var/www/magento/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#12 /var/www/magento/index.php(187): Mage::run('', 'store')
#13 {main}