I'm getting the following error when I try to use a utility to grab the category list from a WordPress Blog. Everything else about the blog seems to be working. What factors might lead to an error like this?
XML error: junk after document element at line 2
Fatal error: Class wp_xmlrpc_server: Cannot inherit from undefined class ixr_server in /usr/www/users/nemock/[domain]/xmlrpc.php on line 60