I can't seem to get section references working in this scrartcl class article (from a template called Eisvogel). I usually use \label{sec:intro} and \ref{sec:intro} and it works fine, now I just see a blank space in the pdf. Am I missing a package?
\PassOptionsToPackage{unicode}{hyperref}
\PassOptionsToPackage{hyphens}{url}
\PassOptionsToPackage{dvipsnames,svgnames,x11names,table}{xcolor}
%
\documentclass[
paper=a4,
,captions=tableheading,hyperref=true
]{scrartcl}
\usepackage{amsmath,amssymb,hyperref}
% Use setspace anyway because we change the default line spacing.
% The spacing is changed early to affect the titlepage and the TOC.
\usepackage{setspace}
\setstretch{1.2}
\usepackage{iftex}
\ifPDFTeX
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{textcomp} % provide euro and other symbols
\else % if luatex or xetex
\usepackage{unicode-math} % this also loads fontspec
\defaultfontfeatures{Scale=MatchLowercase}
\defaultfontfeatures[\rmfamily]{Ligatures=TeX,Scale=1}
\fi
\usepackage{lmodern}
\ifPDFTeX\else
% xetex/luatex font selection
\fi
% Use upquote if available, for straight quotes in verbatim environments
\IfFileExists{upquote.sty}{\usepackage{upquote}}{}
\IfFileExists{microtype.sty}{% use microtype if available
\usepackage[]{microtype}
\UseMicrotypeSet[protrusion]{basicmath} % disable protrusion for tt fonts
}{}
\makeatletter
\@ifundefined{KOMAClassName}{% if non-KOMA class
\IfFileExists{parskip.sty}{%
\usepackage{parskip}
}{% else
\setlength{\parindent}{0pt}
\setlength{\parskip}{6pt plus 2pt minus 1pt}}
}{% if KOMA class
\KOMAoptions{parskip=half}}
\makeatother
\usepackage{xcolor}
\definecolor{default-linkcolor}{HTML}{A50000}
\definecolor{default-filecolor}{HTML}{A50000}
\definecolor{default-citecolor}{HTML}{4077C0}
\definecolor{default-urlcolor}{HTML}{4077C0}
\usepackage[margin=2.5cm,includehead=true,includefoot=true,centering,]{geometry}
\usepackage{listings}
\newcommand{\passthrough}[1]{#1}
\lstset{defaultdialect=[5.3]Lua}
\lstset{defaultdialect=[x86masm]Assembler}
% add backlinks to footnote references, cf. https://tex.stackexchange.com/questions/302266/make-footnote-clickable-both-ways
\usepackage{footnotebackref}
\setlength{\emergencystretch}{3em} % prevent overfull lines
\providecommand{\tightlist}{%
\setlength{\itemsep}{0pt}\setlength{\parskip}{0pt}}
\setcounter{secnumdepth}{-\maxdimen} % remove section numbering
\ifLuaTeX
\usepackage[bidi=basic]{babel}
\else
\usepackage[bidi=default]{babel}
\fi
\babelprovide[main,import]{english}
% get rid of language-specific shorthands (see #6817):
\let\LanguageShortHands\languageshorthands
\def\languageshorthands#1{}
\ifLuaTeX
\usepackage{selnolig} % disable illegal ligatures
\fi
\IfFileExists{bookmark.sty}{\usepackage{bookmark}}{\usepackage{hyperref}}
\IfFileExists{xurl.sty}{\usepackage{xurl}}{} % add URL line breaks if available
\urlstyle{same}
\hypersetup{
pdftitle={Vinaque sanguine metuenti cuiquam Alcyone fixus},
pdfauthor={Author Name},
pdflang={en},
pdfsubject={Markdown},
pdfkeywords={Markdown, Example},
breaklinks=true,
pdfcreator={LaTeX via pandoc with the Eisvogel template}}
\title{Vinaque sanguine metuenti cuiquam Alcyone fixus}
\usepackage{etoolbox}
\makeatletter
\providecommand{\subtitle}[1]{% add subtitle to \maketitle
\apptocmd{\@title}{\par {\large #1 \par}}{}{}
}
\makeatother
\subtitle{Aesculeae domus vincemur et Veneris adsuetus lapsum}
\author{Author Name}
\date{2017-02-20}
%%
%% added
%%
%
% for the background color of the title page
%
\usepackage{pagecolor}
\usepackage{afterpage}
\usepackage{tikz}
\usepackage[margin=2.5cm,includehead=true,includefoot=true,centering]{geometry}
%
% break urls
%
\PassOptionsToPackage{hyphens}{url}
%
% When using babel or polyglossia with biblatex, loading csquotes is recommended
% to ensure that quoted texts are typeset according to the rules of your main language.
%
\usepackage{csquotes}
%
% captions
%
\definecolor{caption-color}{HTML}{777777}
\usepackage[font={stretch=1.2}, textfont={color=caption-color}, position=top, skip=4mm, labelfont=bf, singlelinecheck=false, justification=raggedright]{caption}
\setcapindent{0em}
%
% blockquote
%
\definecolor{blockquote-border}{RGB}{221,221,221}
\definecolor{blockquote-text}{RGB}{119,119,119}
\usepackage{mdframed}
\newmdenv[rightline=false,bottomline=false,topline=false,linewidth=3pt,linecolor=blockquote-border,skipabove=\parskip]{customblockquote}
\renewenvironment{quote}{\begin{customblockquote}\list{}{\rightmargin=0em\leftmargin=0em}%
\item\relax\color{blockquote-text}\ignorespaces}{\unskip\unskip\endlist\end{customblockquote}}
%
% Source Sans Pro as the default font family
% Source Code Pro for monospace text
%
% 'default' option sets the default
% font family to Source Sans Pro, not \sfdefault.
%
\ifnum 0\ifxetex 1\fi\ifluatex 1\fi=0 % if pdftex
\usepackage[default]{sourcesanspro}
\usepackage{sourcecodepro}
\else % if not pdftex
\usepackage[default]{sourcesanspro}
\usepackage{sourcecodepro}
% XeLaTeX specific adjustments for straight quotes: https://tex.stackexchange.com/a/354887
% This issue is already fixed (see https://github.com/silkeh/latex-sourcecodepro/pull/5) but the
% fix is still unreleased.
% TODO: Remove this workaround when the new version of sourcecodepro is released on CTAN.
\ifxetex
\makeatletter
\defaultfontfeatures[\ttfamily]
{ Numbers = \sourcecodepro@figurestyle,
Scale = \SourceCodePro@scale,
Extension = .otf }
\setmonofont
[ UprightFont = -\sourcecodepro@regstyle,
ItalicFont = -\sourcecodepro@regstyle It,
BoldFont = -\sourcecodepro@boldstyle,
BoldItalicFont = -\sourcecodepro@boldstyle It ]
{SourceCodePro}
\makeatother
\fi
\fi
%
% heading color
%
\definecolor{heading-color}{RGB}{40,40,40}
\addtokomafont{section}{\color{heading-color}}
% When using the classes report, scrreprt, book,
% scrbook or memoir, uncomment the following line.
%\addtokomafont{chapter}{\color{heading-color}}
%
% variables for title, author and date
%
\usepackage{titling}
\title{Complexity and Green Bonds}
\author{Alexander Kartun-Giles and Nadia Ameli}
\date{1st of December 2023}
%
% tables
%
%
% remove paragraph indentation
%
\setlength{\parindent}{0pt}
\setlength{\parskip}{6pt plus 2pt minus 1pt}
\setlength{\emergencystretch}{3em} % prevent overfull lines
%
%
% Listings
%
%
%
% general listing colors
%
\definecolor{listing-background}{HTML}{F7F7F7}
\definecolor{listing-rule}{HTML}{B3B2B3}
\definecolor{listing-numbers}{HTML}{B3B2B3}
\definecolor{listing-text-color}{HTML}{000000}
\definecolor{listing-keyword}{HTML}{435489}
\definecolor{listing-keyword-2}{HTML}{1284CA} % additional keywords
\definecolor{listing-keyword-3}{HTML}{9137CB} % additional keywords
\definecolor{listing-identifier}{HTML}{435489}
\definecolor{listing-string}{HTML}{00999A}
\definecolor{listing-comment}{HTML}{8E8E8E}
\lstdefinestyle{eisvogel_listing_style}{
language = java,
numbers = left,
xleftmargin = 2.7em,
framexleftmargin = 2.5em,
backgroundcolor = \color{listing-background},
basicstyle = \color{listing-text-color}\linespread{1.0}%
\lst@ifdisplaystyle%
\small%
\fi\ttfamily{},
breaklines = true,
frame = single,
framesep = 0.19em,
rulecolor = \color{listing-rule},
frameround = ffff,
tabsize = 4,
numberstyle = \color{listing-numbers},
aboveskip = 1.0em,
belowskip = 0.1em,
abovecaptionskip = 0em,
belowcaptionskip = 1.0em,
keywordstyle = {\color{listing-keyword}\bfseries},
keywordstyle = {[2]\color{listing-keyword-2}\bfseries},
keywordstyle = {[3]\color{listing-keyword-3}\bfseries\itshape},
sensitive = true,
identifierstyle = \color{listing-identifier},
commentstyle = \color{listing-comment},
stringstyle = \color{listing-string},
showstringspaces = false,
escapeinside = {/@}{@/}, % Allow LaTeX inside these special comments
literate =
{á}{{'a}}1 {é}{{'e}}1 {í}{{'i}}1 {ó}{{'o}}1 {ú}{{'u}}1
{Á}{{'A}}1 {É}{{'E}}1 {Í}{{'I}}1 {Ó}{{'O}}1 {Ú}{{'U}}1
{à}{{`a}}1 {è}{{`e}}1 {ì}{{`i}}1 {ò}{{`o}}1 {ù}{{`u}}1
{À}{{`A}}1 {È}{{`E}}1 {Ì}{{`I}}1 {Ò}{{`O}}1 {Ù}{{`U}}1
{ä}{{"a}}1 {ë}{{"e}}1 {ï}{{"i}}1 {ö}{{"o}}1 {ü}{{"u}}1
{Ä}{{"A}}1 {Ë}{{"E}}1 {Ï}{{"I}}1 {Ö}{{"O}}1 {Ü}{{"U}}1
{â}{{^a}}1 {ê}{{^e}}1 {î}{{^i}}1 {ô}{{^o}}1 {û}{{^u}}1
{Â}{{^A}}1 {Ê}{{^E}}1 {Î}{{^I}}1 {Ô}{{^O}}1 {Û}{{^U}}1
{œ}{{\oe}}1 {Œ}{{\OE}}1 {æ}{{\ae}}1 {Æ}{{\AE}}1 {ß}{{\ss}}1
{ç}{{\c c}}1 {Ç}{{\c C}}1 {ø}{{\o}}1 {å}{{\r a}}1 {Å}{{\r A}}1
{€}{{\EUR}}1 {£}{{\pounds}}1 {«}{{\guillemotleft}}1
{»}{{\guillemotright}}1 {ñ}{{~n}}1 {Ñ}{{~N}}1 {¿}{{?`}}1
{…}{{\ldots}}1 {≥}{{>=}}1 {≤}{{<=}}1 {„}{{\glqq}}1 {“}{{\grqq}}1
{”}{{''}}1
}
\lstset{style=eisvogel_listing_style}
%
% Java (Java SE 12, 2019-06-22)
%
\lstdefinelanguage{Java}{
morekeywords={
% normal keywords (without data types)
abstract,assert,break,case,catch,class,continue,default,
do,else,enum,exports,extends,final,finally,for,if,implements,
import,instanceof,interface,module,native,new,package,private,
protected,public,requires,return,static,strictfp,super,switch,
synchronized,this,throw,throws,transient,try,volatile,while,
% var is an identifier
var
},
morekeywords={[2] % data types
% primitive data types
boolean,byte,char,double,float,int,long,short,
% String
String,
% primitive wrapper types
Boolean,Byte,Character,Double,Float,Integer,Long,Short
% number types
Number,AtomicInteger,AtomicLong,BigDecimal,BigInteger,DoubleAccumulator,DoubleAdder,LongAccumulator,LongAdder,Short,
% other
Object,Void,void
},
morekeywords={[3] % literals
% reserved words for literal values
null,true,false,
},
sensitive,
morecomment = [l]//,
morecomment = [s]{/}{/},
morecomment = [s]{/*}{/},
morestring = [b]",
morestring = [b]',
}
\lstdefinelanguage{XML}{
morestring = [b]",
moredelim = [s][\bfseries\color{listing-keyword}]{<}{\ },
moredelim = [s][\bfseries\color{listing-keyword}]{</}{>},
moredelim = [l][\bfseries\color{listing-keyword}]{/>},
moredelim = [l][\bfseries\color{listing-keyword}]{>},
morecomment = [s]{<?}{?>},
morecomment = [s]{<!--}{-->},
commentstyle = \color{listing-comment},
stringstyle = \color{listing-string},
identifierstyle = \color{listing-identifier}
}
%
% header and footer
%
\usepackage[headsepline,footsepline]{scrlayer-scrpage}
\newpairofpagestyles{eisvogel-header-footer}{
\clearpairofpagestyles
\ihead{Vinaque sanguine metuenti cuiquam Alcyone fixus}
\chead{}
\ohead{2017-02-20}
\ifoot{Author Name}
\cfoot{}
\ofoot{\thepage}
\addtokomafont{pageheadfoot}{\upshape}
}
\pagestyle{eisvogel-header-footer}
%%
%% end added
%%
\begin{document}
%%
%% begin titlepage
%%
\begin{titlepage}
\newgeometry{top=2cm, right=4cm, bottom=3cm, left=4cm}
\tikz[remember picture,overlay] \node[inner sep=0pt] at (current page.center){\includegraphics[width=\paperwidth,height=\paperheight]{background.pdf}};
\newcommand{\colorRule}[3][black]{\textcolor[HTML]{#1}{\rule{#2}{#3}}}
\begin{flushleft}
\noindent
\[-1em]
\color[HTML]{FFFFFF}
\makebox[0pt][l]{\colorRule[360049]{1.3\textwidth}{0pt}}
\par
\noindent
% The titlepage with a background image has other text spacing and text size
{
\setstretch{2}
\vfill
\vskip -8em
\noindent {\huge \textbf{\textsf{Complexity}}}
\vskip 1em
{\Large \textsf{Network science}}
\vskip 2em
\noindent {\Large \textsf{John} \vskip 0.6em \textsf{1st of December 2023}}
\vfill
}
\end{flushleft}
\end{titlepage}
\restoregeometry
\pagenumbering{arabic}
%%
%% end titlepage
%%
% \maketitle
\section{Introduction}
Some text, see \ref{sec:market}.
\section{A summary of market challenges...}\label{sec:market}
The...
\end{document}
! Unable to load picture or PDF file 'background.pdf'.and produced no output. – David Carlisle Nov 30 '23 at 20:05