Error on 1

{ ["2"] = signal,["3"] = 13,} 
\documentclass{standalone}
\input{/home/zack/.pandoc/custom/preamble_common}
\begin{document}
\nopagecolor
\begin{tikzcd}
    {X_R} && X \\
    \\
    {\operatorname{Spec}R} && Y
    \arrow["f", from=1-3, to=3-3]
    \arrow[from=3-1, to=3-3]
    \arrow[from=1-1, to=1-3]
    \arrow["{f_R}"', from=1-1, to=3-1]
\end{tikzcd}
\end{document}