Fatal error: Uncaught Error: Call to a member function previous() on null in /home/heritagsite/public_html/application/models/Output/ItemAtom.php:236 Stack trace: #0 /home/heritagsite/public_html/application/models/Output/ItemAtom.php(82): Output_ItemAtom->_getFeedLinks(Array) #1 /home/heritagsite/public_html/application/views/scripts/items/browse.atom.php(2): Output_ItemAtom->__construct(Array) #2 /home/heritagsite/public_html/application/libraries/Omeka/View.php(117): include('/home/heritagsi...') #3 /home/heritagsite/public_html/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run('/home/heritagsi...') #4 /home/heritagsite/public_html/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render(NULL) #5 /home/heritagsite/public_html/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(933): Zend_Controller_Action_Helper_ViewRenderer->renderScript('items/browse.at...', NULL) #6 /home/heritagsite/public_html/application/libraries/Zend/Controller/Acti in /home/heritagsite/public_html/application/models/Output/ItemAtom.php on line 236