[lltx] [Fontspec] Problem with \addfontfeature

[TeXWorld]

  Hello,

Here's my system :
Windows Seven
TL 2010
LuaTeX 0.63.0-2010090911 (rev 3872)
Fontspec v2.0b
TeX Gyre Bonum is installed.

I tried to test the code from the Fontspec documentation page 15. Here's 
my code :


\documentclass{article}

\usepackage{xcolor}

\usepackage{fontspec}

\begin{document}

\fontsize{48}{48}

\fontspec{TeX Gyre Bonum Bold}

{\addfontfeature{Color=FF000099}W}\kern-1ex

{\addfontfeature{Color=0000FF99}S}\kern-0.8ex

{\addfontfeature{Color=DDBB2299}P}\kern-0.8ex

{\addfontfeature{Color=00BB3399}R}

\end{document}



When I compile it with XeLaTeX it works except that I have to 
transparency (of course I run Windows...).

The Problem is with LuaLaTeX. I get the following error message :

luaotfload | Font names database loaded: C:/Users/jack/.texlive2010/texmf-v

ar/luatex-cache/generic/names/otfl-names.lua(load: c:/Users/jack/.texlive20

10/texmf-var/luatex-cache/generic/fonts/otf/temp-texgyrebonum-bold.lua)error: 
...0/texmf-dist/tex/luatex/luaotfload/otfl-font-clr.lua:31: bad argument 
#1 to 'tonumber' (string expected, got nil)

.

\newpage ...erypar {}\fi \par \vfil \penalty -\@M

l.11 \end{document}

?