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Anonymous 892
In this MWE

tex
\documentclass{scrartcl}

\usepackage[spanish, activeacute]{babel}
\usepackage{unicode-math}
\usepackage{hyperref}

\begin{document}
\section{A section}
$$j =\sqrt{-1}$$
\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
$$j =\sqrt{-1}$$
\end{document}


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