Cfrgtkky

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=0.5baselineskip,

innerbottommargin=0.5baselineskip,

innerrightmargin=5pt,

innerleftmargin=5pt,

backgroundcolor=yellow!40!white}

mdfdefinestyle{Intro}{

linecolor=white,

outerlinewidth=1pt,

roundcorner=20pt,

innertopmargin=0.5baselineskip,

innerbottommargin=0.5baselineskip,

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)

(/opt/texlive/2015/texmf-dist/tex/latex/tools/afterpage.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/xcolor/xcolor.sty

(/opt/texlive/2015/texmf-dist/tex/latex/latexconfig/color.cfg)

(/opt/texlive/2015/texmf-dist/tex/xelatex/xetex-def/xetex.def)

(/opt/texlive/2015/texmf-dist/tex/latex/colortbl/colortbl.sty

(/opt/texlive/2015/texmf-dist/tex/latex/tools/array.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/graphics/dvipsnam.def))

(/opt/texlive/2015/texmf-dist/tex/latex/tools/verbatim.sty)

(/opt/texlive/2015/texmf-dist/tex/generic/babel/babel.sty

(/opt/texlive/2015/texmf-dist/tex/generic/babel-english/english.ldf

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(/opt/texlive/2015/texmf-dist/tex/generic/babel-italian/italian.ldf))

(/opt/texlive/2015/texmf-dist/tex/latex/etoolbox/etoolbox.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/geometry/geometry.sty

(/opt/texlive/2015/texmf-dist/tex/latex/graphics/keyval.sty)

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(/opt/texlive/2015/texmf-dist/tex/generic/oberdiek/ifvtex.sty)

(/opt/texlive/2015/texmf-dist/tex/generic/ifxetex/ifxetex.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/changepage/changepage.sty)

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(/opt/texlive/2015/texmf-dist/tex/latex/xkeyval/xkeyval.sty

(/opt/texlive/2015/texmf-dist/tex/generic/xkeyval/xkeyval.tex

(/opt/texlive/2015/texmf-dist/tex/generic/xkeyval/xkvutils.tex)))

(/opt/texlive/2015/texmf-dist/tex/latex/adjustbox/adjcalc.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/adjustbox/trimclip.sty

(/opt/texlive/2015/texmf-dist/tex/latex/graphics/graphicx.sty

(/opt/texlive/2015/texmf-dist/tex/latex/graphics/graphics.sty

(/opt/texlive/2015/texmf-dist/tex/latex/graphics/trig.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/latexconfig/graphics.cfg)))

(/opt/texlive/2015/texmf-dist/tex/latex/collectbox/collectbox.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/adjustbox/tc-xetex.def))

(/opt/texlive/2015/texmf-dist/tex/latex/ifoddpage/ifoddpage.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/varwidth/varwidth.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/float/float.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/fancyhdr/fancyhdr.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/fontspec/fontspec.sty

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(/opt/texlive/2015/texmf-dist/tex/latex/l3kernel/l3unicode-data.def)

(/opt/texlive/2015/texmf-dist/tex/latex/l3kernel/l3xdvipdfmx.def))

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(/opt/texlive/2015/texmf-dist/tex/latex/fontspec/fontspec-xetex.sty

(/opt/texlive/2015/texmf-dist/tex/latex/base/fontenc.sty

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(/opt/texlive/2015/texmf-dist/tex/xelatex/xunicode/xunicode.sty

(/opt/texlive/2015/texmf-dist/tex/latex/tipa/t3enc.def

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(/opt/texlive/2015/texmf-dist/tex/latex/amsmath/amsmath.sty

For additional information on amsmath, use the `?' option.

(/opt/texlive/2015/texmf-dist/tex/latex/amsmath/amstext.sty

(/opt/texlive/2015/texmf-dist/tex/latex/amsmath/amsgen.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/amsmath/amsbsy.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/amsmath/amsopn.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/amsfonts/amssymb.sty

(/opt/texlive/2015/texmf-dist/tex/latex/amsfonts/amsfonts.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/amsmath/amscd.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/amscls/amsthm.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/jknapltx/mathrsfs.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/mathtools/mathtools.sty

(/opt/texlive/2015/texmf-dist/tex/latex/tools/calc.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/mathtools/mhsetup.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/l3packages/xfrac/xfrac.sty

(/opt/texlive/2015/texmf-dist/tex/latex/l3packages/l3keys2e/l3keys2e.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/base/textcomp.sty

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(/opt/texlive/2015/texmf-dist/tex/latex/l3packages/xtemplate/xtemplate.sty))

(/opt/texlive/2015/texmf-dist/tex/latex/faktor/faktor.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/booktabs/booktabs.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/shorttoc/shorttoc.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/enumitem/enumitem.sty)

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(/opt/texlive/2015/texmf-dist/tex/latex/frankenstein/slemph.sty

(/opt/texlive/2015/texmf-dist/tex/latex/frankenstein/slemph.cfg))

(/opt/texlive/2015/texmf-dist/tex/latex/frankenstein/titles.cfg))

(/opt/texlive/2015/texmf-dist/tex/latex/titlesec/titlesec.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/titlesec/titletoc.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/subfig/subfig.sty

(/opt/texlive/2015/texmf-dist/tex/latex/caption/caption.sty

(/opt/texlive/2015/texmf-dist/tex/latex/caption/caption3.sty)))

(/opt/texlive/2015/texmf-dist/tex/latex/wrapfig/wrapfig.sty)

(/opt/texlive/2015/texmf-dist/tex/latex/pgf/frontendlayer/tikz.sty

(/opt/texlive/2015/texmf-dist/tex/latex/pgf/basiclayer/pgf.sty

(/opt/texlive/2015/texmf-dist/tex/latex/pgf/utilities/pgfrcs.sty

(/opt/texlive/2015/texmf-dist/tex/generic/pgf/utilities/pgfutil-common.tex

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(/opt/texlive/2015/texmf-dist/tex/latex/ms/everyshi.sty))

(/opt/texlive/2015/texmf-dist/tex/generic/pgf/utilities/pgfrcs.code.tex))

(/opt/texlive/2015/texmf-dist/tex/latex/pgf/basiclayer/pgfcore.sty

(/opt/texlive/2015/texmf-dist/tex/latex/pgf/systemlayer/pgfsys.sty

(/opt/texlive/2015/texmf-dist/tex/generic/pgf/systemlayer/pgfsys.code.tex

(/opt/texlive/2015/texmf-dist/tex/generic/pgf/utilities/pgfkeys.code.tex

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(/opt/texlive/2015/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-xetex.def

(/opt/texlive/2015/texmf-dist/tex/generic/pgf/systemlayer/pgfsys-dvipdfmx.def

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