[NTG-context] Error in the latest beta

Hello, I want to report a bug in the latest beta. I use Mac OS X 10.9.1 and whenever I typeset a file, I get the following error at the end: error: writefont.c: The file format (unknown) for font `lmroman12-regular' is incompatible with wide characters ==> Fatal error occurred, no output PDF file produced! !LuaTeX error: writefont.c: The file format (unknown) for font `lmroman12-regular' is incompatible with wide characters ==> Fatal error occurred, no output PDF file produced! Thanks Jannik