\documentclass{article}
\usepackage[english,hebrew]{babel}
\begin{document}
\pagenumbering{alph}
\begin{enumerate}
\item ~
%\renewcommand{\labelenumii}{\gim{enumii}}
\begin{enumerate}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii}
\item \gim{enumii} % this one causes an error
\end{enumerate}
\end{enumerate}\end{document}
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Using new \hebrewnumeral from Ron Artstein