Anonymous 892
In this MWE
```tex
\documentclass{scrartcl}
\usepackage[spanish, activeacute]{babel}
\usepackage{unicode-math}
\usepackage{hyperref}
\begin{document}
\section{A section}
\begin{equation}
j =\sqrt{-1}
\end{equation}
\end{document}
```
there is a fatal error. However, if I comment `activeacute` or `\usepackage{hyperref}` or `\usepackage{unicode-math]` or I change the kind of document to article, for example, the error disappears. Any help? Thanks

Top Answer

Skillmon
I did not test thoroughly whether all the features work, but it seems like loading `babel` after `unicode-math` fixes the issue at hand.
```tex
\documentclass{scrartcl}
\usepackage{unicode-math}
\usepackage[spanish, activeacute]{babel}
\usepackage{hyperref}
\begin{document}
\section{A section}
'a
\begin{equation}
j =\sqrt{-1}
\end{equation}
\end{document}
```