[NTG-context] subpagenumber

Hi, I want to use sub page numbering in a document but I cannot get it to work. I put these commands in my tex file: \setupsubpagenumber[state=start] \setupfootertexts[][Page \subpagenumber de \numberofsubpages] \starttext \part {Part 1} ..... \part {Part 2} I got this message on my console: ! Undefined control sequence. <argument> Page {\subpagenumber } de \numberofsubpages {}{}{} I'm using ConTeXt ver: 2003.1.31 fmt: 2003.4.23 int: english mes: english Any clues will be appreciated! BTW, is there any samples available of context source files? Samuel