Omeka has encountered an error

Omeka_Record_Exception

There is no element "Dublin Core", "Identifier"!

Omeka_Record_Exception: There is no element "Dublin Core", "Identifier"! in /var/www/html/database/application/models/Mixin/ElementText.php:293
Stack trace:
#0 /var/www/html/database/application/models/Mixin/ElementText.php(214): Mixin_ElementText->getElement('Dublin Core', 'Identifier')
#1 /var/www/html/database/application/libraries/Omeka/Record/AbstractRecord.php(251): Mixin_ElementText->getElementTexts('Dublin Core', 'Identifier')
#2 /var/www/html/database/application/libraries/Omeka/Record/AbstractRecord.php(210): Omeka_Record_AbstractRecord->delegateToMixins('getElementTexts', Array)
#3 /var/www/html/database/application/views/helpers/Metadata.php(183): Omeka_Record_AbstractRecord->__call('getElementTexts', Array)
#4 /var/www/html/database/application/views/helpers/Metadata.php(149): Omeka_View_Helper_Metadata->_getElementText(Object(Item), 'Dublin Core', 'Identifier')
#5 /var/www/html/database/application/views/helpers/Metadata.php(73): Omeka_View_Helper_Metadata->_getText(Object(Item), Array)
#6 /var/www/html/database/application/libraries/Zend/View/Abstract.php(349): Omeka_View_Helper_Metadata->metadata(Object(Item), Array, Array)
#7 /var/www/html/database/application/libraries/globals.php(2038): Zend_View_Abstract->__call('metadata', Array)
#8 /var/www/html/database/application/models/Output/ItemDcmesXml.php(25): metadata(Object(Item), Array, Array)
#9 /var/www/html/database/application/views/scripts/items/browse.dcmes-xml.php(9): Output_ItemDcmesXml->recordToDcmesXml(Object(Item))
#10 /var/www/html/database/application/libraries/Omeka/View.php(117): include('/var/www/html/d...')
#11 /var/www/html/database/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/var/www/html/d...')
#12 /var/www/html/database/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render(NULL)
#13 /var/www/html/database/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(933): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/browse.dc...', NULL)
#14 /var/www/html/database/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(972): Zend_Controller_Action_Helper_ViewRenderer->render()
#15 /var/www/html/database/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#16 /var/www/html/database/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#17 /var/www/html/database/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('browseAction')
#18 /var/www/html/database/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#19 /var/www/html/database/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#20 /var/www/html/database/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#21 /var/www/html/database/application/libraries/Omeka/Application.php(77): Zend_Application->run()
#22 /var/www/html/database/index.php(24): Omeka_Application->run()
#23 {main}