[XeTeX] Unable to read OpenType/TrueType unicode cmap table.

[Nannilam, Baskaran (TNQSoftware)]

Hi,

I am new to XeLaTeX
I have installed MiKTeX latest version with Xelatex.

I need some math symbols in STIXGeneral font. Here I attached small file. 
When I compile the below tex coding..
The following error comes

** WARNING ** Unable to read OpenType/TrueType unicode cmap table.
** WARNING ** Failed to load ToUnicode CMap for font "STIXGeneral-Regular"

Note: When I call \newfontfamily\testfont{STIXGeneral}, It works fine:


Kindly suggest and guide me

Regards
Baskar


%-----------------------------------------------TeX file 
start --------------------------------------------------
\documentclass{article}
\usepackage{mathspec}

\DeclareFontFamily{EU1}{STIXGeneral}{}
\DeclareSymbolFont{operator}{EU1}{STIXGeneral}{m}{n}
\SetSymbolFont{operator}   {normal}{EU1}{STIXGeneral}{m}{n}

\DeclareFontShape{EU1}{STIXGeneral}{m}{n}%
     {<-5.5>    "[STIXGeneral]:mapping=tex-text"     <5.5-6.5> 
"[STIXGeneral]:mapping=tex-text"
      <6.5-7.5> "[STIXGeneral]:mapping=tex-text"     <7.5-8.5> 
"[STIXGeneral]:mapping=tex-text"
      <8.5-9.5> "[STIXGeneral]:mapping=tex-text"     <9.5-11> 
"[STIXGeneral]:mapping=tex-text"
      <11-15>   "[STIXGeneral]:mapping=tex-text"
      <15-> "[STIXGeneral]:mapping=tex-text"
      }{}

\DeclareMathSymbol{+}{\mathbin}  {operator}{'024}
\DeclareMathSymbol{-}{\mathbin}  {operator}{'020}

\begin{document}

This is the text. The {\bfseries\itshape bolditalic} 
vvvvvv\textit{textit}mmmmm\textbf{textbf} yyyyyy
$$(abc+bzc-\sin\theta)\left[\frac{a}{b}\longrightarrow\right]$$
\end{document}
%-----------------------------------------------TeX file 
end--------------------------------------------------