[NTG-context] reference error with startproduct

Hello, when I compile the following product, I get this error: "unknown reference [][bla]" \startproduct product \project project \section[bla]{bla} test: \in[bla] \stopproduct This is the project file: \startproject project \useencoding[ffr] \mainlanguage[fr] \product product \stopproject Could someone help please? Greetings, Peter -- http://pmrb.free.fr/contact/