Chapterstyle in memoir

Question

For some reason I can't compile the following small example in memoir.

\documentclass[oneside,12pt]{memoir}
\begin{document}
\chapterstyle{madsen}

\frontmatter
\tableofcontents
\mainmatter

\chapter{First chapter}
Text
\chapter{Second chapter}
More text

\end{document}

Gives the following error:

! Undefined control sequence.
<argument> \hspace {0.4em}\resizebox 
                                     {!}{4ex}{\chapnamefont \bfseries \sffam...
l.13 \mainmatter

If I comment the line \chapterstyle{madsen} the document compiles well. I have used \chapterstyle{madsen} in other documents before. Why is it that I can't compile this one?

Answer 1

The description of the madsen chapter style on p. 94 of memoir's manual specifies that

\usepackage{graphicx}

is required.