! Package pgfbase Error: Unsupported color model `'. Sorry.

[diekmann]

Here is a minimal example that fails to build on my machine.

\documentclass[t,10pt]{beamer}

\usepackage{moeptikz}

\begin{document}

\begin{frame}
\centering
\begin{tikzpicture}[x=1cm,y=1cm]
    \node[router] (inet) at (0,0) {};
    \node at (inet) {Internet};
    \node[router] (r1) at (.5,0) {};
    \node[router,minimum size=5mm] (r2) at (3,0) {};
    \node[switch, minimum size=10mm] (s1) at (5,0) {};

    \foreach \x in {1,2,3} {
        \node[router,label=right:{PC\,\x}]
            (c\x) at ($(s1)+(+2.8,2.6-1.3*\x)$) {};
        \draw[black,line width=1pt] (c\x) -- (s1);
    }

    \draw[black,line width=1pt] (s1) -- (r1);

\end{tikzpicture}
\end{frame}

\end{document}

The error is

! Package pgfbase Error: Unsupported color model `'. Sorry.

See the pgfbase package documentation for explanation.
Type  H <return>  for immediate help.
 ...                                              

l.29 \end{frame}

With an older version of moeptikz, which required tumcolor, it worked fine.

[diekmann]

When I add the following to the preamble

\usepackage{tikz}
\usetikzlibrary{calc}
\usepackage{moeptikz}

and comment all three

\tikzset{get stroke color}

and all three

\tikzset{replace fill by stroke color/.expand once=\pgfsavedstrokecolor}

it compiles. The result is a grey-scale image.

[moepinet]

Outdated version of texlive.