Omeka ha riscontrato un errore

InvalidArgumentException

Invalid record passed to recordMetadata.

#0 [internal function]: Omeka_View_Helper_Metadata->metadata(NULL, Array, Array)
#1 /var/www/omeka.unito.it/omeka/application/libraries/Zend/View/Abstract.php(350): call_user_func_array(Array, Array)
#2 /var/www/omeka.unito.it/omeka/application/libraries/globals.php(1966): Zend_View_Abstract->__call('metadata', Array)
#3 /var/www/omeka.unito.it/omeka/application/libraries/globals.php(1966): Omeka_View->metadata(NULL, Array, Array)
#4 /var/www/omeka.unito.it/omeka/themes/unito/items/browse.php(81): metadata(NULL, Array)
#5 /var/www/omeka.unito.it/omeka/application/libraries/Omeka/View.php(117): include('/var/www/omeka....')
#6 /var/www/omeka.unito.it/omeka/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/var/www/omeka....')
#7 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(900): Zend_View_Abstract->render('items/browse.ph...')
#8 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(921): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/browse.ph...', NULL)
#9 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(960): Zend_Controller_Action_Helper_ViewRenderer->render()
#10 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Controller/Action/HelperBroker.php(277): Zend_Controller_Action_Helper_ViewRenderer->postDispatch()
#11 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Controller/Action.php(527): Zend_Controller_Action_HelperBroker->notifyPostDispatch()
#12 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Controller/Dispatcher/Standard.php(308): Zend_Controller_Action->dispatch('browseAction')
#13 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Controller/Front.php(954): Zend_Controller_Dispatcher_Standard->dispatch(Object(Zend_Controller_Request_Http), Object(Zend_Controller_Response_Http))
#14 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Application/Bootstrap/Bootstrap.php(97): Zend_Controller_Front->dispatch()
#15 /var/www/omeka.unito.it/omeka/application/libraries/Zend/Application.php(366): Zend_Application_Bootstrap_Bootstrap->run()
#16 /var/www/omeka.unito.it/omeka/application/libraries/Omeka/Application.php(79): Zend_Application->run()
#17 /var/www/omeka.unito.it/omeka/index.php(23): Omeka_Application->run()
#18 {main}