Error in tikz-cd

Question

I am using the folowing codes to generate my tikz commutative diagram.

    \documentclass{book}

    \makeatletter
    %%%%%%%%%%%%%%%%%%%%%%%%%%%%%% User specified LaTeX commands.
    \usepackage{tikz-cd}

    \makeatother

    \begin{document}


\begin{tikzcd}
u \arrow {r} & c
\end{tikzcd}


\begin{tikzcd}
u \arrow [r] & c
\end{tikzcd}

    \end{document}

But when i am using {r} it is not giving error and if I use [r] then it is giving the following error. What I have to do to correct. Because in most of the cases options are in [] only. How to work with that?

Error:

pgfkeys: I do not know the key '/tikz/r' and I am going to ignore it. Perhaps you misspelled it. \end{tikzcd}

Answer 1

You package is outdated. I guess, both tikz-cd and pgf so you will have to use the old syntax \arrow{<direction>}{<label text>} until you manage to update your distribution. There are several posts on this topic around this homepage here.