“dashdotted” command not working for tikz package [closed]

I am trying to create pictures of graphs in TikZ in which I'd like some edges to be dashdotted. I am using TeXShop on both my office computer (Mac) and my personal laptop (Mac), and the file is compiling fine on my office computer but when I try to compile the same file on my laptop, I am getting the following error:

Package pgfkeys Error: I do not know the key '/tikz/dashdotted' and
I am going to ignore it. Perhaps you misspelled it...


I reinstalled the latest version of MacTex on my laptop to see if this fixed the problem, but it has not.

Here is the code I have in my test document which will not compile:

\documentclass{article}
\usepackage{tikz}

\begin{document}

\begin{tikzpicture}
\draw[dashdotted] (0,0)--(10,0);
\end{tikzpicture}

\end{document}

-

closed as too localized by percusse, Kurt, Stefan Kottwitz♦Mar 12 '13 at 15:49

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Which version of PGF/TikZ do you have on your Laptop? Check with \pgfversion. –  Qrrbrbirlbel Mar 8 '13 at 19:42
I have 2.00-cvs. –  Alyson B Mar 8 '13 at 19:57
On the office computer I have version 2.10, if that helps. –  Alyson B Mar 8 '13 at 19:59
That’s an old CVS version. I guess you installed that manually a long time ago in a local texmf tree. Delete it and compile your document again. Maybe you need to update PGF/TikZ then, too. Either way, the current version is 2.10. –  Qrrbrbirlbel Mar 8 '13 at 20:02
Great. How would I locate that old version to delete it? –  Alyson B Mar 8 '13 at 20:04