[OS X TeX] backref

[George Gratzer via MacOSX-TeX]

I'm just finishing a book. The package hyperref works, what a blessing. Unfortunately, 
\usepackage[backref]{hyperref}

does not. 

Error message:

[401] [402] [403]

./CBook0915.tex:20818: LaTeX Error: \verb ended by end of line.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.20818 \bibitem{gCx}

The reference is to

\bibitem{gCx}
G. Cz\'edli,
Slim patch lattices as absolute retracts and maximal lattices.\\
\texttt{arXiv:2105.12868}

Any suggestion?
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