1

I have used this colorbox in a Document:

\newtcolorbox{Titolo}[2][]{
enhanced before skip=2mm,after skip=2mm,
colback=black!5,colframe=black!50,boxrule=0.2mm,
attach boxed title to top left={xshift=1cm,yshift*=1mm-\tcboxedtitleheight},
varwidth boxed title*=-3cm,
boxed title style={frame code={
        \path[fill=tcbcol@back!30!black]
        ([yshift=-1mm,xshift=-1mm]frame.north west)
        arc[start angle=0,end angle=180,radius=1mm]
        ([yshift=-1mm,xshift=1mm]frame.north east)
        arc[start angle=180,end angle=0,radius=1mm];
        \path[left color=tcbcol@back!60!black,right color=tcbcol@back!60!black,
        middle color=tcbcol@back!80!black]
        ([xshift=-2mm]frame.north west) -- ([xshift=2mm]frame.north east)
        [rounded corners=1mm]-- ([xshift=1mm,yshift=-1mm]frame.north east)
        -- (frame.south east) -- (frame.south west)
        -- ([xshift=-1mm,yshift=-1mm]frame.north west)
        [sharp corners]-- cycle;
    },interior engine=empty,
},
fonttitle=\bfseries,
title={#2},#1
}

When I compile with pdflatex I don’t have any problem, but I want to use xelatex, and I get a lot of errors, all similar to the following:

! \textfont 0 is undefined (character c).
\Url@FormatString ...\Url@String \UrlRight \m@th $

l.115 \begin{Titolo}[colbacktitle=black]{Intro}

This is a sample file:

%Class
\documentclass[11pt,a4paper]{book}
\usepackage{appendix}
\usepackage{afterpage}
%Colori
\usepackage[dvipsnames,table,xcdraw]{xcolor}
%Commenti
\usepackage{verbatim}
%Lingua
\usepackage[english, italian]{babel}
\addto{\captionsitalian}{
    \renewcommand{\bibname}{}}
%Margini e Interlinea
\usepackage[top=25mm, bottom=25mm, left=25mm, right=25mm, headheight=15pt]{geometry}
%Stile di pagina principale e numeri di pagina
\usepackage{changepage}
\usepackage{adjustbox}
\usepackage{float}
\usepackage{fancyhdr}
%Font
\usepackage{fontspec}
\setmainfont[Ligatures=TeX]{Times New Roman}
%Matematica
\usepackage{amsmath, amssymb, amscd, amsthm, amsfonts, amsopn}
\usepackage{mathrsfs}
\usepackage{mathtools}
\usepackage{xfrac, faktor} 
%Tabelle
\usepackage{booktabs}
\usepackage{shorttoc}
\usepackage{array}
%Liste
\usepackage{enumitem}
%Titoli
\usepackage{titles}
\usepackage{titlesec}
\usepackage{titletoc}
%Immagini
\usepackage{graphicx}
\usepackage{subfig}
\usepackage{wrapfig}
\usepackage{tikz}
\usepackage{tkz-fct}
\usepackage[font=small, labelfont=bf]{caption}
\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}
\usetikzlibrary{patterns}
\tikzset{mynode/.style={fill,circle,inner sep=2pt,outer sep=0pt}}
%Diagrammi
\usepackage{tikz-cd}
%Indice
\usepackage{imakeidx}
%Collegamenti ipertestuali
\usepackage{url}
\usepackage{hyperref}
\hypersetup
 {colorlinks,
    linkcolor={red!75!black},
    citecolor={ForestGreen},
    urlcolor={Cerulean}}
%Controllo
\usepackage{lipsum}
%Pagine bianche
\newcommand{\Bianco}{\clearpage{{\thispagestyle{empty}\cleardoublepage}}}

%Riquadro1
\usepackage[framemethod=TikZ]{mdframed}
\mdfdefinestyle{Frame}{
linecolor=white,
outerlinewidth=1pt,
roundcorner=20pt,
innertopmargin=0.5\baselineskip,
innerbottommargin=0.5\baselineskip,
innerrightmargin=5pt,
innerleftmargin=5pt,
backgroundcolor=yellow!40!white}
\mdfdefinestyle{Intro}{
linecolor=white,
outerlinewidth=1pt,
roundcorner=20pt,
innertopmargin=0.5\baselineskip,
innerbottommargin=0.5\baselineskip,
innerrightmargin=5pt,
innerleftmargin=5pt,
backgroundcolor=green!20!white}
\usepackage[skins]{tcolorbox}

\newtcolorbox{Titolo}[2][]{
enhanced,
before skip=2mm,after skip=2mm,
colback=black!5,colframe=black!50,boxrule=0.2mm,
attach boxed title to top left={xshift=1cm,yshift*=1mm-\tcboxedtitleheight},
varwidth boxed title*=-3cm,
boxed title style={frame code={
        \path[fill=tcbcol@back!30!black]
        ([yshift=-1mm,xshift=-1mm]frame.north west)
        arc[start angle=0,end angle=180,radius=1mm]
        ([yshift=-1mm,xshift=1mm]frame.north east)
        arc[start angle=180,end angle=0,radius=1mm];
        \path[left color=tcbcol@back!60!black,right color=tcbcol@back!60!black,
        middle color=tcbcol@back!80!black]
        ([xshift=-2mm]frame.north west) -- ([xshift=2mm]frame.north east)
        [rounded corners=1mm]-- ([xshift=1mm,yshift=-1mm]frame.north east)
        -- (frame.south east) -- (frame.south west)
        -- ([xshift=-1mm,yshift=-1mm]frame.north west)
        [sharp corners]-- cycle;
    },interior engine=empty,
},
fonttitle=\bfseries,
title={#2},#1
}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\begin{document}
\begin{Titolo}[colbacktitle=black]{Intro}
Sample
\end{Titolo}
\end{document}  

How can I solve this issue?

The complete .log file is the following:

--RUN xelatex (1)
This is XeTeX, Version 3.14159265-2.6-0.99992 (TeX Live 2015)       (preloaded format=xelatex)
restricted \write18 enabled.
entering extended mode
(./Prova.tex
LaTeX2e <2015/01/01>
Babel <3.9l> and hyphenation patterns for 79 languages loaded.
(/opt/texlive/2015/texmf-dist/tex/latex/base/book.cls
Document Class: book 2014/09/29 v1.4h Standard LaTeX document class
(/opt/texlive/2015/texmf-dist/tex/latex/base/bk11.clo))
(/opt/texlive/2015/texmf-dist/tex/latex/appendix/appendix.sty)
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  • 2
    Welcome to TeX.SX! Works for me (up-to-date TL2018). Could you please post the output of your log file? – TeXnician Dec 1 '18 at 15:20
  • 1
    TeX Live 2015 is quite old. Probably a bug has been fixed since then but I cannot test it. Have you considered updating? – TeXnician Dec 1 '18 at 15:49
  • 2
    I can reproduce the error with TeX Live 2014 (you're using TL 2015, but probably with an outdated version of tcolorbox, I have 3.90, you seem to have 3.60). I don't think there is a reasonable workaround other than updating the TeX distribution. – egreg Dec 1 '18 at 15:53

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