Thread:Project:Support desk/Moving mediawiki 1.10.0 from Windows 2003 server to RHEL 6 server/reply (2)

The other commentor her has pinpointed your issue -- PHP 5.3 is causing the problem. You should install a newer version of MediaWiki and run update.php. If you haven't made any local modifications, then this is pretty straightforward. You may want to look at hiring a consultant to help you (disclaimer -- I'm on that list).