[texhax] A problem running LuaTeX

[Javier Múgica]

I have recently downloaded the beta release of LuaTeX, for Linux. I try to
generate a format and it goes right till it comes to loading the fonts. If I
say either of theses (or others):

\font\twelverm=lmroman12-regular.otf
\font\twelverm=ec-lmr12

I get the message

    not loadable: metric data not found or bad.

Needless to say, the format generates right with etex or pdftex.

Thanks for the help
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