One Super User is unable to delete or rearrange the order of exhibit pages in 4 particular exhibits but has no problem with the rest. Several of us have tried and failed to reproduce the error with those exhibits. The Super User has tried multiple browsers and both Windows and Mac OS. The site is running Omeka 2.3
The error message:
2016-07-25T13:06:58-05:00 ERR (3): exception 'Omeka_Validate_Exception' with message 'Slug: This page slug has already been used. Please modify the slug so that it is unique.' in /var/www/Omeka/application/libraries/Omeka/Record/AbstractRecord.php:535
Stack trace:
#0 /var/www/Omeka/plugins/ExhibitBuilder/models/Exhibit.php(245): Omeka_Record_AbstractRecord->save()
#1 /var/www/Omeka/plugins/ExhibitBuilder/models/Exhibit.php(201): Exhibit->_savePages(Array)
#2 [internal function]: Exhibit->afterSave(Array)
#3 /var/www/Omeka/application/libraries/Omeka/Record/AbstractRecord.php(277): call_user_func(Array, Array)
#4 /var/www/Omeka/application/libraries/Omeka/Record/AbstractRecord.php(550): Omeka_Record_AbstractRecord->runCallbacks('afterSave', Array)
#5 /var/www/Omeka/application/libraries/Omeka/Controller/AbstractActionController.php(229): Omeka_Record_AbstractRecord->save(false)
#6 /var/www/Omeka/application/libraries/Zend/Controller/Action.php(516): Omeka_Controller_AbstractActionController->editAction()
#7 /var/www/Omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('editAction')
#8 /var/www/Omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#9 /var/www/Omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(105): Zend_Controller_Front->dispatch()
#10 /var/www/Omeka/application/libraries/Zend/Application.php(382): Zend_Application_Bootstrap_Bootstrap->run()
#11 /var/www/Omeka/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#12 /var/www/Omeka/admin/index.php(28): Omeka_Application->run()
#13 {main}