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! Undefined control sequence.
l.4441 \writestatus
                   {loading}{ConTeXt System Macros / General}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.4441 \writestatus{l
                     oading}{ConTeXt System Macros / General}
You're in trouble here.  Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

) ("C:\Programme\MiKTeX 2.8\tex\context\base\syst-fnt.mkii")
("C:\Programme\MiKTeX 2.8\tex\context\base\ppchtex.mkii"
! Undefined control sequence.
<argument> \writestatus 
                        {loading}{ConTeXt Chemical Macro's / 1996.3.1}
l.59 ...ing}{ConTeXt Chemical Macro's / 1996.3.1}}
                                                  
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.59 ...ing}{ConTeXt Chemical Macro's / 1996.3.1}}
                                                  
You're in trouble here.  Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

! Undefined control sequence.
l.111   \writestatus
                    {ppchtex}{using PSTricks (still experimental)}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.


! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.111   \writestatus{p
                      pchtex}{using PSTricks (still experimental)}
You're in trouble here.  Try typing  <return>  to proceed.
If that doesn't work, type  X <return>  to quit.

! Undefined control sequence.
l.112   \writestatus
                    {ppchtex}{automatic sizing not (yet) supported}
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.

\horchemical=\count119
\verchemical=\count120
\txtchemical=\count121
\levchemical=\count122
\chemicalsymbols=\box36
\currentchemical=\count123
\chemicalstack=\count124
)))) ("C:\Programme\MiKTeX 2.8\tex\latex\chemsym\chemsym.sty"
Package: chemsym 1998/05/31 v.2.0 Chemical symbols
)

\documentclass[dvips,a4paper]{scrreprt}
\usepackage[T1]{fontenc}
\usepackage[latin1]{inputenc}
\usepackage{ngerman}
\usepackage{m-ch-de}
\usepackage{chemsym}
\begin{document}
\chapter{Kohlenwasserstoffe und ihr Reaktionsverhalten}\marginpar{blabla}
\section{Alkane}
blabla \C_n\H_{2n+2}blabla(\Br_2 , \Cl_2) blabla
\paragraph{Zum Beispiel:}

\section{Alkene}
blabla
\paragraph{Zum Beispiel:}
\subsection{Mechanismus der elektrophilen Addition}
\end{document}