I'm using the below coding in a Tex file, During compilation it shows the error message (attached screenshot). Could anyone guide me how to solve this problem.
\documentclass{amsart}
\usepackage{amsmath, amssymb, amsthm, setspace, tikz-cd, hyperref}
\begin{document}
\section{TikZ-cd}
\[ \begin{tikzcd} A \ar[r, "\widetilde{\pi}"]\ar[ddr, "\pi"', bend right] & \mathcal{T}(X) \ar[dd, dotted, "\exists\hskip .5pt ! \,\psi"] & X \ar[l, "\widetilde{\tau}"'] \ar[ddl, "\tau", bend left]\\ & & \\ & B & \end{tikzcd} \]
\end{document}
