[NTG-context] Newbie question on \completecontent

Suppose I create this document:

\starttext \completecontent \chapter{One} \input tufte \chapter{Two} \input douglas \stoptext

I get a document with a content list and two chaqpters. Now I want to do the same in a project. I take the example from the manual and do this:

%% %% This is the file book.tex %% \startproduct book \project teoade

\startfrontmatter \completecontent \stopfrontmatter

\startbodymatter \component chapters/chapter1 \component chapters/chapter2 \stopbodymatter

\startbackmatter \completeindex \stopbackmatter \stopproduct

I get the chapters allright, but the list of contents and the index are empty. Why? Thanks, Gerben