# Missing $inserted with apacite? \documentclass{article} \usepackage[utf8]{inputenc} \usepackage[natbibapa]{apacite} \title{For testing} \begin{document} Information about natbib in \citeauthor{sharelatex}. \bibliographystyle{apacite} \bibliography{bibli.bib} \end{document}  This gives the error "Missing$ inserted". What has mathmode to do with apacite or citeauthor?

• Check if there aren't any \$ in your bibli.bib file. – Phelype Oleinik Feb 22 '18 at 16:01
• Welcome to TeX.Stackexchange! Can you share your .bib file? – samcarter_is_at_topanswers.xyz Feb 22 '18 at 16:13
• Further to @PhelypeOleinik 's comment, anything that could cause TeX to enter mathmode in a .bib entry (e.g., underscores) could cause this. But without looking at the specify .bib entry, it's hard to tell. – Alan Munn Feb 22 '18 at 16:19
• @samcarter This is the only content in my bib file: @misc{sharelatex, title={ShareLaTeX, the Online LaTeX Editor}, url={nl.sharelatex.com/learn/Natbib_citation_styles}, journal={ShareLaTeX, Online LaTeX-verwerker}} – Simsa Feb 23 '18 at 7:56
• @AlanMunn See my answer above. BTW, Is it possible to reply to multiple anwers :) ? – Simsa Feb 23 '18 at 8:09

The problem is the _ in the url, which can normally only be used in math mode. In order to use them in a url, either use the url or the hyperref package.

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[natbibapa]{apacite}

\usepackage{url}

\usepackage{filecontents}
\begin{filecontents*}{\jobname.bib}
@misc{sharelatex,
title={ShareLaTeX, the Online LaTeX Editor},
url={nl.sharelatex.com/learn/Natbib_citation_styles},
journal={ShareLaTeX, Online LaTeX-verwerker}
}
\end{filecontents*}

\title{For testing}

\begin{document}