ATHR: unknown locale: 21 (-x does not help)

[LOLer6454]

My system specs:
Gigabyte Z87-UD3H
Nvidia GeForce GTX 760
Intel core i7-4770k
8 GB RAM

When I boot verbose, it gives me the error "ATHR: Unknown Locale: 21" and freezes.

Multibeast stuff I have installed:
Realtek ALC898 Driver
Chimera
Default Chameleon theme
Basic Boot Options

What do I try?

EDIT: Full screen pic http://imgur.com/Vff5nQ4

EDIT-DIT: Two more lines appeared. "Resetting IOCatalogue" and "AppleLPC::start - Could not find IOPlatformPlugin driver".

 

[LOLer6454]

Bump. I need this PC for school and it worked fine on Mavericks.

 

[voigtstr]

during verbose boot up I also get the same thing. Lots of ATHR: unknown locale: 21
then a panic: Kernel trap