I am work on lyx and i got problem when i generated pdf?!  The error mg:  ! Package xcolor Error: Undefined color `tcbcol@back'.   The code of local layout:  Style Stop Category              MainText Margin                Static LatexType             Environment LatexName             stopp NextNoIndent          1 LeftMargin            MMM RightMargin           MMM ParIndent             MM ParSkip               0 ItemSep               0 TopSep                0.5 BottomSep             0.5 ParSep                0 Align                 Block AlignPossible         Block, Left, Right, Center Preamble \usepackage{tcolorbox} \usepackage{bclogo} \tcbuselibrary{skins,breakable} \usepackage{xcolor} \newtcolorbox{stoppi}[1][]{enhanced,   before skip=2mm,after skip=3mm,   boxrule=0.4pt,left=5mm,right=10mm,top=1mm,bottom=1mm,   colback=LightSkyBlue!0,   colframe=blue!20!black,   sharp corners,rounded corners=southwest,arc is angular,arc=3mm,   underlay={%     \path[fill=tcbcol@back!80!black] ([yshift=3mm]interior.south west)--++(0.2,-0.1)--++(0.1,-0.2);     \path[draw=tcbcol@frame,shorten &lt;=-0.05mm,shorten &gt;=-0.05mm] ([yshift=3mm]interior.south west)--++(0.2,-0.1)--++(0.1,-0.2);     \path[fill=MidnightBlue!10,draw=none] (interior.south east) rectangle node[white]{\Huge\bfseries\bcstop} ([xshift=-10mm]interior.north east);     },   drop fuzzy shadow,#1} \newenvironment{stopp} {\begin{stoppi}} {\end{stoppi}} EndPreamble End   Please what's the problem in this code, Regards
The definition for marker below is from tcolorbox.doc.s_main.sty. With earlier versions of Texlive (and tcolorbox), this worked fine, but with updated Texlive, it does not.  \documentclass{article} \usepackage{xcolor,tikz,tcolorbox} \usetikzlibrary{shadows} \tcbuselibrary{skins,hooks} \makeatletter % from tcolorbox.doc.s_main.sty \newtcolorbox{marker}[1][]{enhanced,   before skip=2mm,after skip=3mm,   boxrule=0.4pt,left=5mm,right=2mm,top=1mm,bottom=1mm,   colback=yellow!50,   colframe=yellow!20!black,   sharp corners,rounded corners=southeast,arc is angular,arc=3mm,   underlay={%     \path[fill=tcbcol@back!80!black] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);     \path[draw=tcbcol@frame,shorten &lt;=-0.05mm,shorten &gt;=-0.05mm] ([yshift=3mm]interior.south east)--++(-0.4,-0.1)--++(0.1,-0.2);     \path[fill=yellow!50!black,draw=none] (interior.south west) rectangle node[white]{\Huge\bfseries !} ([xshift=4mm]interior.north west);     },   drop fuzzy shadow,#1} \makeatother   \begin{document} \begin{marker}   Hylo! \end{marker}  \end{document}   This gives the following error  ! Package xcolor Error: Undefined color `tcbcol@back'.  See the xcolor package documentation for explanation. Type  H &lt;return&gt;  for immediate help.  ...                                                l.34 \end{marker}  ?   Why are tcbcol@back and tcbcol@frame undefined if they work in the code for the package's documentation? Alternatively, what are the correct names for the colours which were tcbcol@back and tcbcol@frame?  My version of tcolorbox is 2019-09-19.
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