toc style

[Tuukka Toivonen]

I'm now trying to format the TOC for my thesis. The package tocloft looks
promising, but when all three of "tocloft", "koma-script article" and
"fancy headers" are defined, I get
        "\|@chapter undefined"
error.

I tried to replace "fancy headers" with the command "\deftripstyle",
documented in the komascript documentation, but also then I get the same
error.
        \usepackage{scrpage}
        \deftripstyle{default}[0pt][0pt]{}{}{\pagemark}{}{}{}


Here is my full preamble:
------------

% Redefine section styles with \sectionfont etc...
\usepackage{sectsty}

\usepackage{scrpage}
\deftripstyle{default}[0pt][0pt]{}{}{\pagemark}{}{}{}

% Define page number at the page corner
%\fancyhf{}
%\fancyhead[R]{ \thepage }
%\fancypagestyle{plain}{
%\fancyhf{}
%\fancyhead[R]{ \thepage }
%}
% Remove line below top header
%\renewcommand{\headrulewidth}{0pt}

% Add dots in after sections in TOC
\renewcommand*\l@section[2]{%
  \ifnum \c@tocdepth >\m@ne
    \addpenalty{-\@highpenalty}%
    \vskip 1.0em \@plus\p@
    \setlength\@tempdima{1.5em}%
    \begingroup
      \parindent \z@ \rightskip \@pnumwidth
      \parfillskip -\@pnumwidth
      \leavevmode \bfseries
      \advance\leftskip\@tempdima
      \hskip -\leftskip
      #1\nobreak\ 
       \leaders\hbox{$\m@th
        \mkern \@dotsep mu\hbox{.}\mkern \@dotsep
        mu$}\hfil\nobreak\hb@xt@\@pnumwidth{\hss #2}\par
      \penalty\@highpenalty
    \endgroup
  \fi}

\usepackage{tocloft}
% \setlength{\cftbeforetoctitleskip}{10cm}

% Use "Figure x. " instead of "Figure x: "
\usepackage{caption2} 
\renewcommand{\captionlabeldelim}{.}

% Allow using \doublespace and \singlespace
\usepackage{setspace}

% Set toplevel section style
\renewcommand\section{
    \ifx \aftercontents \undefined%
           { }
    \else
        \pagebreak
    \fi
     \@startsection {section}{1}{\z@}%
     {-3.5ex \@plus -1ex \@minus -.2ex}%
     {2.3ex \@plus.2ex}%
     {\normalfont\centering\large\bfseries\uppercase}%
}

% Set subsections headers style
\subsectionfont{\normalfont \centering \normalsize \bfseries }
\subsubsectionfont{\normalfont \normalsize \bfseries }

\newif \ifpdf
    \ifx \pdfoutput \undefined
        \pdffalse
    \else
        \pdftrue
\fi

% Insert PDF information and hyperlinks
\ifpdf
    \pdfinfo { /Author (Tuukka Toivonen)
               /Title (xxx)
               /Subject (Diploma Thesis)
               /Keywords (xxx)
    }
    \usepackage[pdftex]{hyperref}
\else
%    \usepackage[ps2pdf]{hyperref}
\fi