Thread:Project:Support desk/ Extension : (MobileFrontEnd) - !ERROR! - Blank Page/reply

The missing function  indicates your PHP hasn't been compiled with mbstring support.

MediaWiki has had always support for not having mbstring enabled, but I have just found that 1.22 version has introduced a new regression in which mbstring is now required. Enabling mbstring may solve the issue. I'll file a bug about that when bugzilla comes up again.

The first error is a memory issue. You should make sure if it's really happening with mobile frontend or the normal MediaWiki.