[NTG-context] I can't find the format file `cont-nl.fmt'!

Hello, I just installed context to give it a try. my "hello world" test-file gave me the following message. can somebody give me a hint? thanks jan $ texexec context-test.tex TeXExec | processing document 'context-test.tex' TeXExec | no ctx file found TeXExec | tex processing method: context TeXExec | TeX run 1 TeXExec | writing option file context-test.top TeXExec | using randomseed 797 TeXExec | tex engine: pdftex TeXExec | tex format: cont-nl This is pdfeTeX, Version 3.141592-1.30.5-2.2 (Web2C 7.5.5) (/usr/share/texmf/web2c/natural.tcx) kpathsea: Running mktexfmt cont-nl.fmt mktexfmt: no info for format `cont-nl'. I can't find the format file `cont-nl.fmt'! TeXExec | runtime: 0.341153