Offline documentation

Hi,
I tried to build yade documentation offline. I followed YADEDIR/dos/sphinx/README, so I used

PYTHONPATH=. yade-trunk yadeSphinx.py

but ending with this error:

preparing documents...
Theme error:
unsupported theme option 'collapsiblesidebar' given
Traceback (most recent call last):
  File "/usr/local/bin/yade-trunk", line 183, in runScript
    execfile(script,globals())
  File "yadeSphinx.py", line 219, in <module>
    makeBaseClassesClickable((outDir+'/html/yade.wrapper.html' if writer=='html' else outDir+'/latex/Yade.tex'),writer)
  File "yadeSphinx.py", line 151, in makeBaseClassesClickable
    for l in open(f):
IOError: [Errno 2] No such file or directory: '_build/html/yade.wrapper.html'

does anybody know how to fix it?
Thanks
Jan