fix for version incompatibility

application/controllers/ApprovalchainmanagerController.php

@@ -279,7 +279,7 @@ class ApprovalChainManagerController extends Nmc_Controller_Action
         $xhtml = $out->render($template);
         $dom = new DOMDocument();
         $dom->loadHTML($xhtml);
-        $dom->childNodes->item(1)->data .= 'xmlns="http://www.w3.org/1999/xhtml"';
+        $dom->childNodes->item(1)->setAttribute('xmlns', 'http://www.w3.org/1999/xhtml');
         header('Content-type: application/xhtml+xml');
         echo $dom->saveXML();
     }