[OS X TeX] backref

[George Gratzer via MacOSX-TeX]

Consider this tex file:

\documentclass{amsart} 
\usepackage[backref]{hyperref}

\begin{document}
\title{Testing backref}

\maketitle

\section{Introduction}
xxx  

\begin{thebibliography}{9}

\bibitem{gCcc}
G. Cz\'edli,
A property.\\
\verb!+arXiv:2112.07594!

\end{thebibliography}
\end{document}

Cannot run it. Why?

GG
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