# Problem with example in tcolorbox package

When I try to run this simple example from the manual:

\documentclass{report}
\begin{document}
\tcbset{frame style={top color=red!20!white,
bottom color=red!20!white!75!black},
fonttitle=\bfseries,coltitle=black}

\begin{tcolorbox}[enhanced,title=My title,interior hidden]
This is a \textbf{tcolorbox}.
\tcblower
This is the lower part.
\end{tcolorbox}
\end{document}


I get a strange error:

! Package pgfkeys Error: I do not know the key '/tcb/frame style', to which you
passed 'top color=red!20!white, bottom color=red!20!white!75!black', and I am
going to ignore it. Perhaps you misspelled it.

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

l.82         fonttitle=\bfseries,coltitle=black}

-------------------------------------------------------------------------------------------------


I have read on Stack Exchange and other forums that the problem is an outdated version of tcolorbox, but I am running the latest version of both tcolorbox and of PGF, here the inserts from the log file:

Package: tcolorbox 2015/03/16 version 3.50 text color boxes

Package: pgf 2013/12/18 v3.0.0 (rcs-revision 1.14)


Anyone can shed some light on the problem?

You have to load the appropriate library for frame style to work out. Here it is skins. If in doubt, you may add most or many as the options to tcolorbox

\documentclass{report}
\usepackage[skins]{tcolorbox}
%\usepackage[most]{tcolorbox}
\begin{document}
\tcbset{frame style={top color=red!20!white,
bottom color=red!20!white!75!black},
fonttitle=\bfseries,coltitle=black}

\begin{tcolorbox}[enhanced,title=My title,interior hidden]
This is a \textbf{tcolorbox}.
\tcblower
This is the lower part.
\end{tcolorbox}
\end{document}


• Right on! Very cryptic message on part of the package that should know the skin library is not loaded! Thanks very much. – Paulo Ney Apr 27 '15 at 0:30
• @PauloNey Thanks for the up vote. :-) – user11232 Apr 27 '15 at 0:31