'Too many symbol fonts declared' error when repeating custom math environment

Question

I have this "Too many symbol fonts declared" that is different from the two other posts in the forum.

I am writing a book section where I have several subfiles with custom math symbols (from the open source cool jazz font). I can repeat up to 6 subfiles (6 different sections) but for the 7th I get the "too many symbol fonts declared" error and the subfile does not render the math part... Here is my MWE to reproduce the error:

Main.tex file:

%minimal example
\documentclass[11pt,portuguese, twoside,openright]{book}
\usepackage[T1]{fontenc}
\usepackage{fontspec}
\usepackage{enumerate}
\usepackage[math-style=ISO, bold-style=ISO]{unicode-math}
%setting an environment for hand- solved examples
\newenvironment{coolj}{
    %\defaultfontfeatures{Scale=MatchUppercase}
    \setmonofont{CMU Typewriter Text}[Scale = .90]
    \setmainfont{Cooljazz}[Scale = .85]
    \setmainfont[Ligatures=TeX,BoldFont={Boogaloo Regular},Scale=.90]{Cool jazz}
    \setmathfont[math-style=upright, range={"00-"FF,
        "03C0, "2013-"2014, "2018-"201A, "201C-"201E, "2021-"2022,
        "2026, "2030, "2039-"203A, "2044, "20AC, "20BA, "20BD,
        "2113, "2122, "2126, "212E, "2202, "2206, "2208, "220F, "2211,
        "2212, "2215, "221E, "222B, "2246, "2260, "2264, "2265,
        "25CA, up/{Latin,latin,num,Greek,greek}},Scale=0.85]{cooljazz.ttf}
    \setmathfont[range={"58-"60}]{Latin Modern Math}
}{\par}
\usepackage{subfiles} % to load independent chapters
\begin{document}
Main doc
%repeating several subfiles with coolj enviroment

\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\end{document}

As you can see I am inputting a subfile (here for simplicity always the same, but different files are used in the real scenario):´

ex1.tex:

\documentclass[main.tex]{subfiles}
\usepackage{enumerate}
\begin{document}
Some text...
\begin{coolj}{Example 1}
This is example 1 with text describing the problem


\begin{enumerate}
\item Some text

\item Some math with cooljaz.ttf font defined in the main tex doc coolj environment
\item[] $H^{}_0: \mu_{Baseline}=\mu_{M04}=\mu_{M08}=\mu_{M12} \quad vs.\\H^{M}_1: \exists i, j: \mu_i \neq \mu_j \quad i \neq j; \ i,j=(Baseline,M04, M08, M12)$
\item[]$H^{M\times G}_0\!:\gamma_{M\times G}\!=\!0  \quad vs. \quad H^{M\times G}_1:\!\gamma_{M\times G}\! \neq\! 0$
\item [] $S'^2_{\bar Y} \neq \sum_{i=1}^{n}(Y_i- \bar Y)^2$


\end{enumerate}
Some more text with free font cooljaz.ttf
\end{coolj}
\vspace{\baselineskip}
back to regular text!...
\end{document}

It works fine with 6 ex1.tex subfiles, but for the 7th it gives this error and does not render correctly:

Too many symbol fonts declared. \begin{coolj}
Symbol font __um_fam13 not defined. \begin{coolj}
\begin{coolj} Missing number, treated as zero. \begin{coolj}

Any idea on how to solve this problem? The full book will have more than 100 examples (I hope...using the cooljazz font. If you want to see the font the link is https://freefontsfamily.com/cool-jazz-font-family-free-download/

Thanks!

Answer 1

This works:

\documentclass[11pt,portuguese, twoside,openright]{book}
\usepackage{fontspec}
\usepackage{enumerate}
\usepackage[math-style=ISO, bold-style=ISO]{unicode-math}
\setmathfont{Latin Modern Math}% default math font
\setmathfont[math-style=upright, range={"00-"FF,
        "03C0, "2013-"2014, "2018-"201A, "201C-"201E, "2021-"2022,
        "2026, "2030, "2039-"203A, "2044, "20AC, "20BA, "20BD,
        "2113, "2122, "2126, "212E, "2202, "2206, "2208, "220F, "2211,
        "2212, "2215, "221E, "222B, "2246, "2260, "2264, "2265,
        "25CA, up/{Latin,latin,num,Greek,greek}},Scale=0.85]{cooljazz.ttf}
\setmathfont[range={"58-"60}]{Latin Modern Math}    
\newfontface\CoolJazz[Scale=0.85,Ligatures=TeX,BoldFont={Boogaloo Regular}]{Cool jazz}
\setmonofont{CMU Typewriter Text}[Scale = .90]
%setting an environment for hand- solved examples
\newenvironment{coolj}
  {\CoolJazz}{\par}
\usepackage{subfiles} % to load independent chapters
\begin{document}
Main doc
%repeating several subfiles with coolj enviroment

\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\end{document}

If you need another math font for other text then use the optional argument version

Answer 2

for future reference for other people that may want to use handwriting fonts without "Math Tables". This is a solution, copied and adapted as needed from this StackExchange fonts-Create a Handwriting environment that works:

\usepackage[no-math]{fontspec}
%\usepackage{amsmath}
\usepackage{mathtools}
%\usepackage{siunitx}
\newfontfamily\cooljazz[NFSSFamily=cooljazz]{cooljazz}
\usepackage[subdued, defaultmathsizes]{mathastext}
\MTfamily{cooljazz}
\Mathastext[cooljazz]
\newenvironment{coolj}{\MTversion{cooljazz}\MTdonotfixfonts
    \setmainfont{cooljazz}[Scale = .5, Extension = .ttf ]
    % adjust some additional glyphs
    \Umathchardef\prod 1 \symmtoperatorfont ∏\relax % mathop \Umathchardef\sum 1 \symmtoperatorfont∑\relax % mathop
    \Umathchardef\in   3 \symmtoperatorfont ∈\relax % \Umathchardef\int 1 \symmtoperatorfont∫\relax % mathop
    \Umathchardef\neq  3 \symmtoperatorfont ≠\relax % mathrel %\Umathchardef\sqrt 1 \symmtoperatorfont√\relax % mathrel
    \Umathchardef\mu  1 \symmtoperatorfont μ\relax % greek \Umathchardef\sigma 1 \symmtoperatorfontσ\relax % greek
    \Umathchardef\gamma 1 \symmtoperatorfont γ\relax % greek \Umathchardef\beta 1 \symmtoperatorfontβ\relax % greek
    \Umathchardef\epsilon 1 \symmtoperatorfont ε\relax % greek \Umathchardef\eta 1 \symmtoperatorfontη\relax % greek
    \Umathchardef\alpha 1 \symmtoperatorfont α\relax % greek \Umathchardef\theta 1 \symmtoperatorfontθ\relax % greek
    \Umathchardef\rho 1 \symmtoperatorfont ρ\relax % greek \Umathchardef\phi 1 \symmtoperatorfontϕ\relax % greek
    \Umathchardef\sim 1 \symmtoperatorfont ~\relax % greek \Umathchardef\exists 1 \symmtoperatorfont∃\relax % greek
    %
}{\par}
\usepackage{subfiles} % to load independent chapters
\begin{document}
Main doc

%repeating several subfiles with coolj enviroment   
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}
\subfile{ex1}


\end{document} 

You will need the ex1.tex file in the beginning of this (long) trend.

There are still some minor glitches (e.g. the \sqrt overline does not extend over the all expression) and it is a little work to get all the greek symbols and math operators, but...

Learning on how to do add a math table for a given font would be the way to go, but that requires time and skills (and I lack both :-))

Thank you all for the input suggestions and explanations! You guys rock!