[NTG-context] Export and itemize

Hi, I sometimes misuse the command key of itemize like this: \definehighlight[important][style=italic, color=red] \starttext \startitemize[command=\important] \item {Term}: definition \stopitemize \stoptext However when I try this with \setupbackend[export=yes] I get the following error: ! LuaTeX error bad argument #3 to '?' (value expected). system > tex > error on line 0 in file : LuaTeX error ... <empty file> <*> ./export.tex \stoptext Bug or I am just doing this wrong? Aditya