[luatex] not able to load a PostScript font

[Pablo Rodríguez]

Hi there,

I have tried to use in the same single LuaLaTeX document an OpenType 
font and a PostScript font.

\documentclass[10pt]{book}
\usepackage{luaotfload}
\usepackage[EU2]{fontenc}
\usepackage{fontspec}
\setmainfont{Theano Didot}
\setmonofont{WebOMints GD}
\begin{document}
This is only a test.
\end{document}

But I get an error, because fontspec is not able to find the metrics for 
the PostScript font.

How should I do it?

Thanks for your help,


Pablo