line 1 error on MiKTeX [closed]

Question

I was typesetting a paper with MiKTeX when I got a strange error. Usually I try to Google most of the stuff but I could not figure this one out. I have used \documentclass[12pt,a4paper]{article} after some \section and some \subsection I get an error on the first line (the \documentclass[12pt,a4paper]{article} part) Why?

I have a section with 9 subsections without problems, but if a make it 10 subsections it immediately gives an error at line 1. (even if I just copy paste subsection 9, so there is no error with that I guess)

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From a comment:

\documentclass[12pt,a4paper]{article}
\usepackage[dutch]{babel}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{parskip}
\usepackage[pdftex]{graphicx}
\usepackage{color}
\usepackage[usenames,dvipsnames,svgnames,table]{xcolor}
\usepackage{soul}
\newcommand{\HRule}{\rule{\linewidth}{0.5mm}}
\parindent=0pt
\parskip=\smallskipamount
\frenchspacing
\begin{document}
…
\end{document}