Thread:Project:Support desk/Unable to Edit WikiPage Copyrights message appear

Hi,

We have on our website this wikihelp files which we are unable to edit. mediawiki version 1.16.0 PHP version: 5.4.28 For example: if we try to edit this page: http://www.trueerp.com/wiki/Main_Page it gives this message: Please note that all contributions to TrueERP wiki are considered to be released under the GNU Free Documentation License 1.2 (see TrueERP wiki:Copyrights for details). If you do not want your writing to be edited mercilessly and redistributed at will, then do not submit it here. You are also promising us that you wrote this yourself, or copied it from a public domain or similar free resource. Do not submit copyrighted work without permission!

Please tell me how to resolve this issue, upgrading mediawiki version will resolve this issue?