XeLaTeX Font Warning: Font shape `TS1/Arial(0)/m/n' undefined, how to fix it?

Question

I hope a quick and easy solution is possible

• Error Code

LaTeX Font Warning: Font shape TS1/Arial(0)/m/n' undefined (Font) usingTS1/cmr/m/n' instead on input line 75.

• Main Problem

  The error showcases that I can't manage to change the math font to a choice of mine while using mathspec package

• Explanation

  I searched through old topics on the forum, with examples such as usage of "fontspec", usage of "renewcommands" and more. But they all can't seem to fix my error or allow me to use basically Arial as a main font(bold, italic etc.) and FOR EXAMPLE Cambria Math for Math fonts. The substitution named "cmr" looks kinda odd if combined with Arial.

If Cambria Math is a stupid idea to use with Arial, feel free to provide a better solution!

Here is the minimum example so you can also observe that error message(and see how unfitting Arial + cmr is):

Minimum Working Example with complete Preamble

    \documentclass[hidelinks,11pt,egregdoesnotlikesansseriftitles]{scrartcl}
            \usepackage[T1]{fontenc}
            \usepackage{apacite}
            \usepackage[showframe=true]{geometry} 
            \usepackage{graphicx}
            \usepackage{caption}     
            \usepackage{mathspec}
        \setmainfont{Arial}
        \setmathfont{Cambria Math}%an example, feel free to suggest something that works
            \usepackage{natbib} 
            \usepackage[table,xcdraw]{xcolor}
            \usepackage{array}
            \usepackage[english]{babel}
            \usepackage{geometry} 
            \usepackage{setspace}
            \usepackage{eurosym}
            \usepackage{multirow}
            \usepackage{siunitx}

        \makeatletter
        \newcommand{\MSonehalfspacing}{%
          \setstretch{1.44}%  default
          \ifcase \@ptsize \relax % 10pt
            \setstretch {1.448}%
          \or % 11pt
            \setstretch {1.399}%
          \or % 12pt
            \setstretch {1.433}%
          \fi
        }
        \makeatother
        \MSonehalfspacing   

            \usepackage[headsepline,automark,singlespacing=true]{scrlayer-scrpage} 
                \clearpairofpagestyles 
                \ihead{\rightmark} 
                \ohead{\pagemark} 
                \addtokomafont{pageheadfoot}{\upshape\bfseries} 
                \KOMAoptions{onpsinit=\setstretch{1}} 

            \usepackage{textcomp}
            \usepackage{gensymb}        

        \makeatletter
        \let\Hy@linktoc\Hy@linktoc@none
        \makeatother


        \let\oldtabular\tabular
        \renewcommand{\tabular}{\small\oldtabular}
        \setkomafont{caption}{\small}

        \geometry{a4paper, top=25mm, left=25mm, right=25mm, bottom=25mm,includehead} 
        \setlength{\parindent}{0pt}

            \usepackage{apacdoc}


        \addto\captionsenglish{% Replace "english" with the language you use
          \renewcommand{\contentsname}%
            {Table of Contents}%
        }
        \usepackage{hyperref}
        \def\UrlBreaks{\do\/\do-}


        \makeatletter
        \newcommand{\tocfill}{\cleaders\hbox{$\m@th \mkern\@dotsep mu . \mkern\@dotsep mu$}\hfill}
        \makeatother
        \newcommand{\abbrlabel}[1]{\makebox[4cm][l]{\textbf{#1}\ \tocfill}}
        \newenvironment{abbreviations}{\begin{list}{}{\renewcommand{\makelabel}{\abbrlabel}%
                                                      \setlength{\itemsep}{0pt}}}{\end{list}}

    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%            
        \begin{document}


        Test

        \textbf{Many Test much hurt}

        \textit{Tester Rester}

        $ \frac{22}{33}$ How can I change the font of the numbers to be similar to Arial? It doesn't have to be Arial, just a similar font type. Heck there might be a more elegant solution?

        \end{document}

Answer 1

EDIT:

You don't really need mathcomp either. I was doing the bare minimum to remove the font substitution from your document. If you use unicode-math package, as suggested by @Herbert in the other answer, you can revise my original answer to:

\documentclass[11pt]{scrartcl}

\usepackage{fontspec}
\usepackage{unicode-math}
\setmainfont{Arial}
\setmathfont{Cambria Math}


\begin{document}

°C
$°C$
Ω
$Ω$
‰
$‰$
μ
$μ$
‱
$‱$

\end{document}

As you can see, using unicode-math allows you to use the symbols directly in math mode also. You can get rid of mathspec and use the more standard fontspec options. And this approach still allows you to use Cambria Math. Again, the only issue is with the last symbol: ‱ (this time, also in math mode - because both Arial and Cambria Math do not appear to have ‱)

Bringing this all back together with your preamble, I've updated @Herbert's preamble to remove gensymb, textcomp, and mathcomp packages and use fontspec instead:

\documentclass[11pt]{scrartcl}

\usepackage{fontspec}
\usepackage{unicode-math}
\setmainfont{Arial}
\setmathfont{Cambria Math}

\usepackage{apacite}
\usepackage[showframe=true]{geometry} 
\usepackage{graphicx}
\usepackage{caption}     
\usepackage{eurosym}
\usepackage{multirow}
\usepackage{siunitx}
\usepackage{natbib} 
\usepackage[table,xcdraw]{xcolor}
\usepackage{array}
\usepackage[english]{babel}
\usepackage{geometry} 
\usepackage{setspace}

\makeatletter
\newcommand{\MSonehalfspacing}{%
    \setstretch{1.44}%  default
    \ifcase \@ptsize \relax % 10pt
    \setstretch {1.448}%
    \or % 11pt
    \setstretch {1.399}%
    \or % 12pt
    \setstretch {1.433}%
    \fi
}
\makeatother
\MSonehalfspacing   

\usepackage[headsepline,automark,singlespacing=true]{scrlayer-scrpage} 
\clearpairofpagestyles 
\ihead{\rightmark} 
\ohead{\pagemark} 
\addtokomafont{pageheadfoot}{\upshape\bfseries} 
\KOMAoptions{onpsinit=\setstretch{1}} 


\makeatletter
\let\Hy@linktoc\Hy@linktoc@none
\makeatother


\let\oldtabular\tabular
\renewcommand{\tabular}{\small\oldtabular}
\setkomafont{caption}{\small}

\geometry{a4paper, top=25mm, left=25mm, right=25mm, bottom=25mm,includehead} 
\setlength{\parindent}{0pt}

\usepackage{apacdoc}


\addto\captionsenglish{% Replace "english" with the language you use
    \renewcommand{\contentsname}%
    {Table of Contents}%
}
\usepackage{hyperref}
\def\UrlBreaks{\do\/\do-}


\makeatletter
\newcommand{\tocfill}{\cleaders\hbox{$\m@th \mkern\@dotsep mu . \mkern\@dotsep mu$}\hfill}
\makeatother
\newcommand{\abbrlabel}[1]{\makebox[4cm][l]{\textbf{#1}\ \tocfill}}
\newenvironment{abbreviations}{\begin{list}{}{\renewcommand{\makelabel}{\abbrlabel}%
            \setlength{\itemsep}{0pt}}}{\end{list}}
\begin{document}

°C
$°C$
Ω
$Ω$
‰
$‰$
μ
$μ$
‱
$‱$

\end{document}

This produces the same image above.

Original:

A quick note: this is not an error message. It is a warning message.

The real problem comes from \usepackage{gensymb}. If you comment that out (without any changes from your original example), the error is removed.

As others mentioned, you should also remove \usepackage[T1]{fontenc} and use \usepackage{fontspec} (which is loaded by mathspec anyway).

According to gensymb documentation, it seems to expect the textcomp package and loading \usepackage[T1]{fontenc}. The real question is... do you need exactly the symbols that gensymb? Or can you find the appropriate symbol elsewhere (such as the comprehensive symbols guide - which lists packages, if necessary)?

gensymb was written in 2003 and does not appear to have been updated since. The package only provides \de­gree, \cel­sius, \pert­hou­sand, \mi­cro and \ohm.

Using this MWE, however, I find you do not need gensymb or textcomp packages:

\documentclass[11pt]{scrartcl}

\usepackage{mathspec}
\setmainfont{Arial}
\setmathfont{Cambria Math}

\usepackage{mathcomp}  

\begin{document}

°C
$\tccentigrade$
Ω
$\tcohm$
‰
$\tcperthousand$
μ
$\tcmu$
‱
$\tcpertenthousand$

\end{document}

So you see, you can just copy and paste the symbols directly (in text mode) and use the mathcomp commands in math mode.

The only real problem is that ‱ appears not to be available with Arial. You'll need to find either another package with the symbol, or another font for it.

EDIT: This will not work in pdfLaTeX, by the way.

Answer 2

use this preamble and run thr document with xelatex:

\documentclass[hidelinks,11pt,egregdoesnotlikesansseriftitles]{scrartcl}
\usepackage{apacite}
\usepackage[showframe=true]{geometry} 
\usepackage{graphicx}
\usepackage{caption}     
\usepackage{eurosym}
\usepackage{multirow}
\usepackage{siunitx}
\usepackage{gensymb}        
\usepackage{unicode-math}
\setmainfont{Arial}
\setmathfont{Cambria Math}%an example, feel free to suggest something that works
\usepackage{natbib} 
\usepackage[table,xcdraw]{xcolor}
\usepackage{array}
\usepackage[english]{babel}
\usepackage{geometry} 
\usepackage{setspace}

\makeatletter
\newcommand{\MSonehalfspacing}{%
    \setstretch{1.44}%  default
    \ifcase \@ptsize \relax % 10pt
    \setstretch {1.448}%
    \or % 11pt
    \setstretch {1.399}%
    \or % 12pt
    \setstretch {1.433}%
    \fi
}
\makeatother
\MSonehalfspacing   

\usepackage[headsepline,automark,singlespacing=true]{scrlayer-scrpage} 
\clearpairofpagestyles 
\ihead{\rightmark} 
\ohead{\pagemark} 
\addtokomafont{pageheadfoot}{\upshape\bfseries} 
\KOMAoptions{onpsinit=\setstretch{1}} 

%\usepackage{textcomp}

\makeatletter
\let\Hy@linktoc\Hy@linktoc@none
\makeatother


\let\oldtabular\tabular
\renewcommand{\tabular}{\small\oldtabular}
\setkomafont{caption}{\small}

\geometry{a4paper, top=25mm, left=25mm, right=25mm, bottom=25mm,includehead} 
\setlength{\parindent}{0pt}

\usepackage{apacdoc}


\addto\captionsenglish{% Replace "english" with the language you use
    \renewcommand{\contentsname}%
    {Table of Contents}%
}
\usepackage{hyperref}
\def\UrlBreaks{\do\/\do-}


\makeatletter
\newcommand{\tocfill}{\cleaders\hbox{$\m@th \mkern\@dotsep mu . \mkern\@dotsep mu$}\hfill}
\makeatother
\newcommand{\abbrlabel}[1]{\makebox[4cm][l]{\textbf{#1}\ \tocfill}}
\newenvironment{abbreviations}{\begin{list}{}{\renewcommand{\makelabel}{\abbrlabel}%
            \setlength{\itemsep}{0pt}}}{\end{list}}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%