Upgrade Error: dom_import_simplexml() 5.5.2.1 to 5.6.0.2
PermalinkWarning: dom_import_simplexml(): Invalid Nodetype to import in /usr/local/www/concrete5/updates/concrete5.6.0.2/concrete/core/controllers/single_pages/upgrade.php on line 200
Warning: dom_import_simplexml(): Invalid Nodetype to import in /usr/local/www/concrete5/updates/concrete5.6.0.2/concrete/core/controllers/single_pages/upgrade.php on line 201
Fatal error: Call to a member function appendChild() on a non-object in /usr/local/www/concrete5/updates/concrete5.6.0.2/concrete/core/controllers/single_pages/upgrade.php on line 202
I do have the XML extension installed in PHP but haven't been able to figure out why the error message is coming up.