Math symbols not being printed.

Question

I am having problems printing an equation. I have the following definitions:

\documentclass{scrreprt}

\usepackage{mathspec}
\defaultfontfeatures{Mapping=tex-text,BoldFeatures={Weight=2}}

\setmathfont[
    Scale=0.95,
    Extension=.otf,
    UprightFont= *-regular,
    BoldFont=*-bold,
    ItalicFont=*-italic,
    BoldItalicFont=*-bolditalic,
]{texgyrethermes}

\usepackage{unicode-math}

\begin{document}
    \begin{equation} 
        \label{constraint:inference} 
        D \models C \iff V(D) \models \top \Longrightarrow V(C) \models \top 
    \end{equation}
\end{document}

This is the putput that I am getting:

Answer 1

Remove the \usepackage{unicode-math} command. This package is only for use with specific unicode math fonts (of which there are only about three: Cambria Math, Asana Math and xits). So you should stick with mathspec.