Omeka has encountered an error

Zend_Date_Exception

unsupported ISO8601 format ()

exception 'Zend_Date_Exception' with message 'unsupported ISO8601 format ()' in /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Date.php:2084
Stack trace:
#0 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Date.php(1078): Zend_Date->_calculate('set', false, 'c', 'en_US')
#1 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Date.php(197): Zend_Date->set(false, 'c', 'en_US')
#2 /mnt/data_0/www/html/globalvalley/application/libraries/globals.php(1005): Zend_Date->__construct(false, 'c')
#3 /mnt/data_0/www/html/globalvalley/plugins/Scripto/views/shared/index/diff.php(47): format_date(false, 'KKK')
#4 /mnt/data_0/www/html/globalvalley/application/libraries/Omeka/View.php(114): include('/mnt/data_0/www...')
#5 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/mnt/data_0/www...')
#6 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render('index/diff.php')
#7 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(933): Zend_Controller_Action_Helper_ViewRenderer->renderScript('index/diff.php', NULL)
#8 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(972): Zend_Controller_Action_Helper_ViewRenderer->render()
#9 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#10 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#11 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('diffAction')
#12 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#13 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#14 /mnt/data_0/www/html/globalvalley/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#15 /mnt/data_0/www/html/globalvalley/application/libraries/Omeka/Application.php(73): Zend_Application->run()
#16 /mnt/data_0/www/html/globalvalley/index.php(23): Omeka_Application->run()
#17 {main}