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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}

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    I suspect you have an older version of tikz-cd – egreg Nov 27 '15 at 10:07
  • means how i can update it??? I am using linux mint 13 and texstudio as my texeditor – David Nov 27 '15 at 10:09
  • I don't know about Linux Mint, but I'd install a full TeX Live independent from the laziness of GNU/Linux distribution maintainers, see tex.stackexchange.com/questions/1092/… – egreg Nov 27 '15 at 10:12
  • First, I would try to find out what your current version of tikz-cd is. But linux mint 13 seems to be pretty old, so probably egreg is correct. In any case, if you don't succeed to update it, you can also read the documentation of tikz-cd for your version (texdoc tikz-cd, or find tikz-cd-doc.pdf). – jarauh Nov 27 '15 at 18:59
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You package is outdated.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.

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