Errors using the example from TikZ manual

Hi,

with the following code I encounter errors for unknown reasons. The
tutorial pages are 46-48 where the code is taken from.

As I get only digests from this list, please put myself in CC that I get
any reply faster.

Bernhard

\begin{document}

\maketitle

\begin{tikzpicture}
  [transition/.style={rectangle,draw=black!50,fill=black!05,thick,inner
sep=0pt,minimum size=10mm}]

  \node at (0,9) [transition] (startleft)   {1};
  \node at (1,9) [transition] (startmiddle) {};
  \node at (2,9) [transition] (startright)  {};

  \node at (1,6) [transition] (nextleft)    {1}
    edge [<-] (startmiddle);
  \node at (2,6) [transition] (nextmiddle)  {L};
  \node at (3,6) [transition] (nextright)   {R};

\end{tikzpicture}
\\[5mm]

\begin{tikzpicture}
  [transition/.style={rectangle,draw=black!50,fill=black!05,thick,inner
sep=0pt,minimum size=10mm},
   pre/.style={<-,shorten <=1pt,>=stealth’,semithick}]

  \node at (0,9) [transition] (startleft)   {1};
  \node at (1,9) [transition] (startmiddle) {};
  \node at (2,9) [transition] (startright)  {};

  \node at (1,6) [transition] (nextleft)    {1}
    edge [pre] (startmiddle);
  \node at (2,6) [transition] (nextmiddle)  {L};
  \node at (3,6) [transition] (nextright)   {R};

\end{tikzpicture}

\end{document}

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