Omeka has encountered an error

Omeka_View_Exception

A current exhibit variable has not been set to this view.

exception 'Omeka_View_Exception' with message 'A current exhibit variable has not been set to this view.' in /www/www.lib/web/online-exhibits/application/views/helpers/GetCurrentRecord.php:27
Stack trace:
#0 [internal function]: Omeka_View_Helper_GetCurrentRecord->getCurrentRecord('exhibit', true)
#1 /www/www.lib/web/online-exhibits/application/libraries/Zend/View/Abstract.php(351): call_user_func_array(Array, Array)
#2 /www/www.lib/web/online-exhibits/application/libraries/globals.php(1879): Zend_View_Abstract->__call('getCurrentRecor...', Array)
#3 /www/www.lib/web/online-exhibits/application/libraries/globals.php(1879): Omeka_View->getCurrentRecord('exhibit', true)
#4 /www/www.lib/web/online-exhibits/plugins/ExhibitBuilder/helpers/ExhibitFunctions.php(50): get_current_record('exhibit')
#5 /www/www.lib/web/online-exhibits/themes/mlibrary_new/items/show.php(47): exhibit_builder_exhibit_uri(NULL)
#6 /www/www.lib/web/online-exhibits/application/libraries/Omeka/View.php(114): include('/www/www.lib/we...')
#7 /www/www.lib/web/online-exhibits/application/libraries/Zend/View/Abstract.php(889): Omeka_View->_run('/www/www.lib/we...')
#8 /www/www.lib/web/online-exhibits/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render('items/show.php')
#9 /www/www.lib/web/online-exhibits/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(933): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/show.php', NULL)
#10 /www/www.lib/web/online-exhibits/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(972): Zend_Controller_Action_Helper_ViewRenderer->render()
#11 /www/www.lib/web/online-exhibits/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#12 /www/www.lib/web/online-exhibits/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#13 /www/www.lib/web/online-exhibits/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('showAction')
#14 /www/www.lib/web/online-exhibits/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#15 /www/www.lib/web/online-exhibits/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(106): Zend_Controller_Front->dispatch()
#16 /www/www.lib/web/online-exhibits/application/libraries/Zend/Application.php(384): Zend_Application_Bootstrap_Bootstrap->run()
#17 /www/www.lib/web/online-exhibits/application/libraries/Omeka/Application.php(73): Zend_Application->run()
#18 /www/www.lib/web/online-exhibits/index.php(23): Omeka_Application->run()
#19 {main}