Fatal error: Uncaught Error: Class 'DOMDocument' not found in /var/www/html/Mappalachia/omeka-2.7.1/application/models/Output/ItemAtom.php:28 Stack trace: #0 /var/www/html/Mappalachia/omeka-2.7.1/application/views/scripts/items/browse.atom.php(2): Output_ItemAtom->__construct() #1 /var/www/html/Mappalachia/omeka-2.7.1/application/libraries/Omeka/View.php(114): include('/var/www/html/M...') #2 /var/www/html/Mappalachia/omeka-2.7.1/application/libraries/Zend/View/Abstract.php(888): Omeka_View->_run() #3 /var/www/html/Mappalachia/omeka-2.7.1/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(912): Zend_View_Abstract->render() #4 /var/www/html/Mappalachia/omeka-2.7.1/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(933): Zend_Controller_Action_Helper_ViewRenderer->renderScript() #5 /var/www/html/Mappalachia/omeka-2.7.1/application/libraries/Zend/Controller/Action/Helper/ViewRenderer.php(972): Zend_Controller_Action_Helper_ViewRenderer->render() #6 /var/www/html/Mappalachia/omeka-2.7.1/app in /var/www/html/Mappalachia/omeka-2.7.1/application/models/Output/ItemAtom.php on line 28