[NTG-context] color as module parameter (mkiv)

Hi, I am trying to pass a tex color as a paramter to a module. I used the example from the wiki as a base. But as soon I hand over a color directly it does not work. Any help is welcome as I am looking forward to hand in my first module. Are there any rules how and where to hand in a module for context? Thanks P. --8<---Modul: bgcolor.tex--------------- \startmodule[bgcolor] \unprotect \definecolor[grau][s=.35] \setupmodule[color=grau] \setupbackgrounds[page][background=color,backgroundcolor=\currentmoduleparameter{color}] \protect \stopmodule \endinput --8<--tex file itself--------- \setupcolors[state=start] \definecolor[bordeaux][r=.66] \usemodule[bgcolor][color=bordeaux] \starttext Hello world! \stoptext