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I'm trying to get the following mdframedexample from the package documentation to work (mdframed-example-default page 5), but it's throwing the following errors

Missing number, treated as zero T
Illegal unit of measure (pt inserted) T

and displays a peculiar "pt" before printing the environment contents with the title box positioned too low. How to fix this? The title box should be just on the middle of the top line.

\documentclass{article}

\usepackage{tikz,mdframed}

\begin{document}

\mdfsetup{skipabove=\topskip,skipbelow=\topskip}
\newcounter{theo}[section] 
\newenvironment{theo}[1][]{%
\stepcounter{theo}% 
    \ifstrempty{#1}% 
    {\mdfsetup{%
        frametitle={%
            \tikz[baseline=(current bounding box.east),outer sep=0pt]
            \node[anchor=east,rectangle,fill=blue!20]
            {\strut Theorem~\thetheo};}}%
    }%
    {\mdfsetup{% 
        frametitle={%
            \tikz[baseline=(current bounding box.east),outer sep=0pt]
            \node[anchor=east,rectangle,fill=blue!20]
            {\strut Theorem~\thetheo:~#1};}}%
    }%
    \mdfsetup{innertopmargin=10pt,linecolor=blue!20,%
            linewidth=2pt,topline=true,
            frametitleaboveskip=\dimexpr−\ht\strutbox\relax,}
    \begin{mdframed}[]\relax%
    }{\end{mdframed}}

\begin{theo}
    This is an example theorem
    %
    \begin{equation}
        a^2 + b^2 = c^2
    \end{equation}
\end{theo}

\end{document}

resulting in

enter image description here

6

The line

frametitleaboveskip=\dimexpr−\ht\strutbox\relax

has a strange character (probably a result of the copy-paste process) just before \ht that must be replaced by a standard minus sign:

frametitleaboveskip=\dimexpr-\ht\strutbox\relax

The code:

\documentclass{article}

\usepackage{tikz,mdframed}

\mdfsetup{skipabove=\topskip,skipbelow=\topskip}
\newcounter{theo}[section] 
\newenvironment{theo}[1][]{%
\stepcounter{theo}% 
    \ifstrempty{#1}% 
    {\mdfsetup{%
        frametitle={%
            \tikz[baseline=(current bounding box.east),outer sep=0pt]
            \node[anchor=east,rectangle,fill=blue!20]
            {\strut Theorem~\thetheo};}}%
    }%
    {\mdfsetup{% 
        frametitle={%
            \tikz[baseline=(current bounding box.east),outer sep=0pt]
            \node[anchor=east,rectangle,fill=blue!20]
            {\strut Theorem~\thetheo:~#1};}}%
    }%
    \mdfsetup{innertopmargin=10pt,linecolor=blue!20,%
            linewidth=2pt,topline=true,
            frametitleaboveskip=\dimexpr-\ht\strutbox\relax,}
    \begin{mdframed}[]\relax%
    }{\end{mdframed}}

\begin{document}

\begin{theo}
test
    \begin{equation}
        a^2 + b^2 = c^2
    \end{equation}
\end{theo}

\end{document}

enter image description here

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