NSInvalidArgumentException: NSBundle(class) does not recognize loadGSMarkupNamed:owner:

[csanyipal]

Hi,

I have installed GNUstep on Gentoo GNU/Linux (arch: amd64).
I installed it using emerge.

I have installed Gshisen.app too, and can run it successfully.

I'm developing my 'LPT_Interface.app' application.
When I run 'openapp ./LPT_Interface.app' I get Error message on a dialog
box: 
Button  Critical Error in LPT_Interface

NSInvalidArgumentException: NSBundle(class) does not recognize \
loadGSMarkupNamed:owner:

On the xterm window I get messages:
2010-07-30 18:01:23.778 LPT_Interface[15051] The font specified for
NSFont, Helvetica, can't be found. 
2010-07-30 18:01:23.782 LPT_Interface[15051] The font specified for
NSUserFont, Helvetica, can't be found. 
2010-07-30 18:01:23.783 LPT_Interface[15051] The font specified for
NSFont, Helvetica, can't be found. 
2010-07-30 18:01:23.786 LPT_Interface[15051] The font specified for
NSMessageFont, Helvetica, can't be found. 
2010-07-30 18:01:23.789 LPT_Interface[15051] The font specified for
NSMessageFont, Helvetica, can't be found. 

When I hit button Abort on dialog box, I get more info:
/home/csanyipal/Programozas/Obj_C_ben/Emacs-szal/LPT_Interface/\
LPT_Interface.app/LPT_Interface:
Uncaught exception NSInvalidArgumentException, reason: NSBundle(class)
does not recognize loadGSMarkupNamed:owner: 

How can I solve this problem?
Any advices will be appreciated!

-- 
Regards, Paul Chany
You can freely correct me in my English.
http://csanyi-pal.info