Thanks for replying. Adminsettings.php was removed in i think mediawiki 1.17 and above. So please regenerate the localsettings.php because new settings were added. I would suggest doing another install of MediaWiki on a sub domain create the localsettings.php file for the website your doing and copying the bits that look odd but also keeping the extensions as they are.
Please see https://www.mediawiki.org/wiki/Manual:AdminSettings.php and try that first read the upgrading section.