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The following code fails with the error

! LaTeX Error: Command \mybox already defined. Or name \end... illegal, see p.192 of the manual. \usepackage[most]{tcolorbox} \newtcolorbox{mybox}[2][]{% colback=bg, colframe=blue!75!black, fonttitle=\bfseries, coltitle=blue!75!black, colbacktitle=bg, enhanced, attach boxed title to top left={yshift=-1.2mm, xshift=2mm}, title=#2, #1} %-------------------- \usepackage{fancybox} %pour faire l'encadrement \newcommand{\mybox}[1]{ \setlength{\fboxsep}{7pt} \begin{center} \shadowbox{#1} \end{center}} %--------------------

Could you please help me

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    You can have both a tcolorbox mybox and a command \mybox. Choose another name. Commented Dec 15, 2017 at 11:41
  • Please help me because I'm beginer Commented Dec 15, 2017 at 11:43
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    you just need to call it something else so change \newcommand{\mybox}[1]{ to \newcommand{\anythingbutnotmybox}[1]{ Commented Dec 15, 2017 at 11:46
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    Sorry I meant "you can't" not "you can". Commented Dec 15, 2017 at 11:55
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    In case you weren't aware, and you are confused why \mybox is already defined: When you write \begin{mybox} LaTeX translates that into \mybox with some checking around it. Therefore, when you created the environment mybox as a new tcolorbox, internally, that defined the command \mybox :) Commented Dec 15, 2017 at 12:42

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You just replace \mybox by for example \cadre us follows:

 \usepackage[most]{tcolorbox} \newtcolorbox{mybox}[2][]{% colback=bg, colframe=blue!75!black, fonttitle=\bfseries, coltitle=blue!75!black, colbacktitle=bg, enhanced, attach boxed title to top left={yshift=-1.2mm, xshift=2mm}, title=#2, #1} %-------------------- \usepackage{fancybox} %pour faire l'encadrement \newcommand{\cadre}[1]{ \setlength{\fboxsep}{7pt} \begin{center} \shadowbox{#1} \end{center}} %--------------------
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