\Ac command not defined

Question

I use acronym package in my Latex file. Strangely, some of its commands, like \Ac are not defined when I compile my file. The \ac command works fine though.

\documentclass[12pt]{extarticle}
\usepackage[printonlyused]{acronym}
\usepackage{multicol}

\title{Physical Layer Security}

\begin{document}
\maketitle
\Ac{BER} is a metric. 

\section{Acronyms}
\begin{multicols}{2}
    \begin{acronym}     
        \acro{BER}{bit-error rate}
    \end{acronym}
\end{multicols}

\end{document}

And here is the error I see:

! Undefined control sequence. \Ac

Welcome to TeX.SE! Thank you for including a minimal working example and the text of your error message. I'm sure it won't be long before someone can help you. — dgoodmaniii, Nov 13 '19 at 13:07
Actually, even sooner: somebody's already answered this question. https://tex.stackexchange.com/questions/80003/capitalising-the-first-letter-of-an-acronym/150798#150798 — dgoodmaniii, Nov 13 '19 at 13:19
You are probably using an old version of the package acronym. Take a look into the log file. The version should be 1.42 or higher. This version is on CTAN since yesterday — gernot, Nov 13 '19 at 17:14
I have the latest version of the acronym package with MikTeX updated this morning and the compilation is not finished. — AndréC, Nov 13 '19 at 18:09
See https://miktex.org/faq, section Troubleshooting, question "where does miktex put diagnostic messages — gernot, Nov 13 '19 at 18:57
@gernotsaysReinstateMonica I know where to find the log, but I don't know how to communicate it to you. It is too big to fit in a commentary. — AndréC, Nov 13 '19 at 20:16

gernot · Answer 1 · 2019-11-13T17:49:57.033

0

You have to use version 1.42 of package acronym or higher for \Ac to work.

To check, take a look into the log file. You should find a line there that reads

Package: acronym 2019/11/11 v1.42 Support for acronyms (Tobias Oetiker)

If you get the error Undefined control sequence. \Ac, it is likely that you will find

Package: acronym 2015/03/21 v1.41 Support for acronyms (Tobias Oetiker)

instead.

edited Nov 13 '19 at 17:49

answered Nov 13 '19 at 17:17

gernot

49,614

I have the latest version of the acronym package with MikTeX updated this morning and the compilation is not finished. – AndréC Nov 13 '19 at 18:09

\Ac command not defined

1 Answers1