http://www.icyphoenix.com/viewtopic.php?f=35&t=8499&p=55637#p55637
-----------------------------------
TheSteffen
Sun 29 Apr, 2012 23:28

Re: ACP Anmeldung Funktioniert Nicht - Fehler Im ACP Bei Einigen Änderungen, Wo Man Erst Die Sprache Wählen Muss
-----------------------------------
Thanks [b]Joshua203[/b], for you aswer.

[b]BrollyLSSJ[/b], please contact me on IP.de, so I can answer your questions there.

About the error you post...
You have to set the right permission (chmod 666) for that lang files
lang_faq.php, lang_rules.php  and lang_bbcode.php 

I did it right now for your Site... so it should work fine.