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This question already has an answer here:

What means these error mease by using

\usepackage{firamath-otf}

Code:

\documentclass{article}
\usepackage{fontspec}
\usepackage{firamath-otf}
\begin{document}
\begin{equation}
x+y=45
\end{equation}

The compilation was by XeLaTex

enter image description here

marked as duplicate by siracusa, Mico, Mensch, Raaja, Stefan Pinnow Sep 1 at 7:37

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

  • The error messages indicate that either your unicode-math-xetex or expl3 package is outdated. Try updating your packages from the MiKTeX console. – siracusa Sep 1 at 4:32
  • 1
    Please do not ask questions twice! This is a duplicate of your first question tex.stackexchange.com/questions/506501/segoe-ui-for-math-mode. Wait for an answer or add more information to make your first question clearer, for example add the first line of your log file to show us the used tex distribution and version number. – Mensch Sep 1 at 4:32
  • @siracusa, I don't have these package in MiKTeX console. I have unicode-math installed yesterday and exp-testopt – Marcia Cross Sep 1 at 4:49
  • I guess unicode-math-xetex is part of unicode-math; expl3 seems to be part of l3kernel. Is the latter also up-to-date? – siracusa Sep 1 at 5:36
  • That package has to be installed, it's required by unicode-math – siracusa Sep 1 at 5:50
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Open MiKTeX Console, click on Packages (marked red 1), add firamath in search field (marked red 2), click on symbol marked red 3, select needed package (marked red 4) and click on + sign (marked red 5) to install.

firamath-package

Simular you can checkif it is installed or install unicode-math with:

unicode-math

But at last best would be to have a complete MiKTeX installed, then you need not to install missing packages ...

Please see column marked with red arrow and 1: There you can see the date when the package was installed or an missing date shows you it is not installed yet ...

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