Omeka has encountered an error

Zend_Http_Client_Exception

Unable to read response, or response is empty

#0 /home/virtualv/public_html/volunteer/plugins/Scripto/libraries/Scripto/Service/MediaWiki.php(661): Zend_Http_Client->request('POST')
#1 /home/virtualv/public_html/volunteer/plugins/Scripto/libraries/Scripto/Service/MediaWiki.php(450): Scripto_Service_MediaWiki->_request('parse', Array)
#2 /home/virtualv/public_html/volunteer/plugins/Scripto/libraries/Scripto/Service/MediaWiki.php(398): Scripto_Service_MediaWiki->parse(Array)
#3 /home/virtualv/public_html/volunteer/plugins/Scripto/libraries/Scripto/Document.php(368): Scripto_Service_MediaWiki->getLatestRevisionHtml('.ODE.MTg2NA')
#4 /home/virtualv/public_html/volunteer/plugins/Scripto/controllers/IndexController.php(184): Scripto_Document->getTranscriptionPageHtml()
#5 /home/virtualv/public_html/volunteer/application/libraries/Zend/Controller/Action.php(516): Scripto_IndexController->transcribeAction()
#6 /home/virtualv/public_html/volunteer/application/libraries/Zend/Controller/Dispatcher/Standard.php(295): Zend_Controller_Action->dispatch('transcribeActio...')
#7 /home/virtualv/public_html/volunteer/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#8 /home/virtualv/public_html/volunteer/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#9 /home/virtualv/public_html/volunteer/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#10 /home/virtualv/public_html/volunteer/application/libraries/Omeka/Core.php(165): Zend_Application->run()
#11 /home/virtualv/public_html/volunteer/index.php(28): Omeka_Core->run()
#12 {main}