[NTG-context] Need help : Fatal mem file error; I'm stymied

Hi, I just start using conTeXt for a week, I found this problem when i try to compile a *.tex file. my file look like this: \usemodule[pre-03] \starttext hello \stoptext compile with texexec --pdf filename.tex and I saw this : ..... This is MetaPost, Version 0.641 (Web2C 7.3.1) (Fatal mem file error; I'm stymied) ..... This error message exist as long as there is \usemodule[pre-xx] with xx is one of 01-06...etc I use tetex-1.0.7-57 with RedHat8.0, Thanks lihb@phys.sinica.edu.tw 2003/04/21