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I am trying to duplicate part of an example code given in the tcolorbox package documentation on page 13. It looks like this:

\begin{tcolorbox}[sidebyside,title=Lower not separated,lower separated=false]
This is the upper part.
This is the lower part.

enter image description here

It all looks good except for the dashed vertical line that should not be there. The above code generates the error:

pgfkeys:Ido not know the key /tcb/lower separated...

The log file sends me to the pgfkeys package. Section 55 on Key Management (page 481) in the pgfmanual doesn't provide me with an answer.So what's wrong here? Perhaps there's just something missing as in this example: Problem with "Package pgfkeys Error".

And how to give each part a different color?

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closed as unclear what you're asking by Christian Hupfer, Maarten Dhondt, Joseph Wright Dec 28 '15 at 9:34

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question.If this question can be reworded to fit the rules in the help center, please edit the question.

Welcome to TeX.SX! Running your example I don't get any errors: do you have the last version? Mine is 2.51 (2013/09/16). – Claudio Fiandrino Nov 25 '13 at 6:49
I just compiled your example without error messages. My guess is that you work with an old version of tcolorbox. The current version is 2.51 (2013/09/16). The specific key was introduced with version 2.33. You should check your logfile for your version, i.e. a line like Package: tcolorbox 2013/09/16 version 2.51 text color boxes for the current version. – Thomas F. Sturm Nov 25 '13 at 8:29

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