NUI Paint - Python

python ./nuipaint.py
[INFO ] Fbo will use hardware Framebuffer
Traceback (most recent call last):
File "./nuipaint.py", line 6, in <module>
from core import *
File "/media/datos/FIREFOX/NUIPaint_0.1_RC_1/core/__init__.py", line 1, in <module>
from ui import *
File "/media/datos/FIREFOX/NUIPaint_0.1_RC_1/core/ui/__init__.py", line 1, in <module>
from toolbar import *
File "/media/datos/FIREFOX/NUIPaint_0.1_RC_1/core/ui/toolbar.py", line 4, in <module>
from core.app.observer import *
File "/media/datos/FIREFOX/NUIPaint_0.1_RC_1/core/app/__init__.py", line 1, in <module>
from canvas import *
File "/media/datos/FIREFOX/NUIPaint_0.1_RC_1/core/app/canvas/__init__.py", line 3, in <module>
from layerlist import *
File "/media/datos/FIREFOX/NUIPaint_0.1_RC_1/core/app/canvas/layerlist.py", line 67, in <module>
css_add_sheet(additional_css)
NameError: name 'css_add_sheet' is not defined

- System: Archlinux x86_64
- Python 2.6 installed
- Pyglet installed (1.1.3-1)
- Numpy installed (1.3.0-2)
- Pymp installed (0.0.4-1)

Thanks.