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I came back to a .tex file I haven't used in a couple of years and it no longer compiles. I've narrowed down the problem to the titlesec package (I think); if I can find out why this MWE won't compile maybe I'll find my answer:

%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode

   \documentclass[paper=4.25in:6.75in,pagesize=auto,fontsize=9.5pt,headings=small,BCOR=.25mm,openany,DIV=16]{scrbook}

\usepackage{blindtext}

\usepackage[compact]{titlesec}
\titlespacing{\section}{0pt}{2ex}{1ex}
\titlespacing{\subsection}{0pt}{1ex}{0ex}
\titlespacing{\subsubsection}{0pt}{0.5ex}{0ex}
\vspace{-1mm}

\begin{document}
\chapter{red}
\blindtext
\section{blue}
\blindtext
\subsection{green}
\blindtext
\subsubsection{yellow}




\end{document}

This is the error thrown:

test+001.tex:17: Missing number, treated as zero. 
<to be read again>
                                }
1.17 \section{blue}
?

If I add these lines the tex file compiles:

\titleformat{\section}
 {\normalfont\Large\bfseries}{\thesection}{1em}{}
\titleformat{\subsection}
 {\normalfont\large\bfseries}{\thesubsection}{1em}{}
\titleformat{\subsubsection}
 {\normalfont\normalsize\bfseries}{\thesubsubsection}{1em}{}

closed as off-topic by Schweinebacke, Stefan Pinnow, TeXnician, Kurt, CarLaTeX Aug 14 '17 at 19:04

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  • 2
    What's \vspace{-1mm} supposed to do in the preamble? – egreg Aug 14 '17 at 9:57
  • 1
    Using titlesec with the koma-script classes isn't recommended. – Bernard Aug 14 '17 at 10:09
  • 1
    Compiles without error for me. Is your system up-to-date? – Ulrike Fischer Aug 14 '17 at 10:34
  • 2
    There was a bug in titlesec once. Tryvto update that package. – Johannes_B Aug 14 '17 at 11:25
  • 4
    I'm voting to close this question as off-topic because the error can be fixed by a simple update of classes and packages or upgrade of TeX Live. – Schweinebacke Aug 14 '17 at 17:30

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