Thread:Project:Support desk/Fatal: mbstring.func overload is active! (2)

I've just tried installing my wiki and i got the following error on the initial page:

Fatal: mbstring.func_overload is active! This option causes errors and may corrupt data unpredictably; you cannot install or use MediaWiki unless this option is disabled.

Any help would be very much appreciated!

EDIT: I appologise for posting this twice, I didn't think the first one worked, and i don't know how to delete this one.