1. Yes of course, i meant google webmasters tools. Google let you choose the preferred domain to index your website, with or without www prefix. After that the Joomla website must run accordingly with the same domain chosen
2. Ensure that you are accessing the Joomla backend accordingly,
http://www.runningtext.id/administrator or
http://runningtext.id/administrator. If you are working for
http://www.runningtext.id you must access and work with jsitemap using
http://www.runningtext.id/administrator and not
http://runningtext.id/administrator
John