# Error message with hobby package

I am trying to use the hobbypackage with this minimal example from the manual:

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{hobby}
\begin{document}
\begin{tikzpicture}[scale=.5,use Hobby shortcut]
\draw (0,0) .. (6,4) .. (4,9) .. (1,7) .. (3,5) .. cycle;
\end{tikzpicture}
\end{document}


On compiling with pdflatex I get this error message:

! Undefined control sequence.
\hobby_genpath: ...y }\prg_stepwise_function:nnnN
{0}{1}{\l_hobby_npoints_in...
l.7 .... (6,4) .. (4,9) .. (1,7) .. (3,5) .. cycle
;


I am using TeXLive 2012 and the hobby.code.tex that came with it.

What can I do to get it working?

P.S. Googling came up with a message on the Italian TeX Group forum but I could not cotton on to what was being said.

-
Essentially, egreg in this post explained that the function \prg_stepwise_function:nnnN has been substituted by \int_step_function:nnnN; I used the workaround suggested by him, for example, in my last edit to How can I draw an egg using TikZ?. –  Claudio Fiandrino Apr 25 '13 at 10:10
@Claudio Fiandrino: thanks for the explanation and that link: it was real fun! –  chandra Apr 25 '13 at 11:12

This is fixed in the latest version of the hobby package. Unfortunately, I didn't get it to CTAN in time for the TL freeze (8th April according to TUG) so if you use TeXLive you'll have to install it yourself from CTAN (or wait until TL2013 is released). (MikTeX works differently, I believe.)
You can download the latest version directly from CTAN at hobby.
Thanks a million for the hobby package and for the clarification. I have updated and tried it out. It works! The operative line in the minimal example should now be: \draw [closed] (0,0) .. (6,4) .. (4,9) .. (1,7) .. (3,5); to get the desired results. –  chandra Apr 25 '13 at 11:14