\usepackage{fontspec}
\setmainfont{Minion Pro}
\usepackage[partial=literal]{unicode-math}
\setmathfont{Asana Math}
\setmathfont[range=\mathup] {Minion Pro}
\setmathfont[range=\mathbfup]{Minion Pro Bold}
\setmathfont[range=\mathbfit]{Minion Pro Bold Italic}
\setmathfont[range=\mathit] {Minion Pro Italic}
%%% re-load main math font to ensure correct MATH table values are used:
\setmathfont[range={\mathtt->\mathtt}]{Asana Math}
For what its worth, simplifying the above to
\usepackage{fontspec}
\setmainfont{Minion Pro}
\usepackage{unicode-math}
\setmathfont{Asana Math}
makes no difference. Same error.
