Missing number is treated as zero for bibliography and section

I have the following example code. Code for the setting file (settings) is as follows;

% Included by MAIN.TEX
% Defines the settings for the CAMP report document

renewcommand{sectfont}{normalfont bfseries}        % Schriftart der Kopfzeile

% manipulate footer
usepackage{scrpage2}
pagestyle{scrheadings}
ifoot[footertext]{footertext} % footertext set in INFO.TEX
%setkomafont{pagehead}{normalfontrmfamily}
setkomafont{pagenumber}{normalfontrmfamily}

%% allow sophisticated control structures
usepackage{ifthen}

% use Times New Roman as default font
usepackage{times}
%usepackage{palatino}
%usepackage{mathptmx}

%use as default arial font

usepackage{helvet}
renewcommand{familydefault}{sfdefault}

%% parskip: used for spaces between paragraphs, no indentation
%usepackage{parskip}

% enable special PostScript fonts
usepackage{pifont}

% make thumbnails
usepackage{thumbpdf}

%to use the subfigures
%usepackage{subfigure}
%usepackage{subcaption}
%usepackage{subfigure}

usepackage{colortbl}

%Page Dimension
    usepackage[left=1.5in,right=1in,top=1in,bottom=1in]{geometry}
    %usepackage{setspace}doublespacing
    usepackage{setspace}





usepackage{multirow}

%% use colors
usepackage{color}

%% make fancy math
%usepackage{amsmath}
usepackage[
intlimits,
sumlimits
]{amsmath}
usepackage{amsfonts}
usepackage{amssymb}
usepackage{textcomp}
usepackage{yhmath} % fr die adots
%% k text as preliminary
%usepackage[draft,german,scrtime]{prelim2e}

%% create an index
usepackage{makeidx}

% for the program environment
usepackage{float}

%% load german babel package for german abstract
%usepackage[german,american]{babel}
usepackage[german,english]{babel}
selectlanguage{english}
usepackage{ellipsis}
usepackage{microtype}
usepackage{soul}
usepackage{booktabs}
usepackage{tabularx}
usepackage{longtable}
usepackage{multirow}

% use german characters as well
usepackage[latin1]{inputenc}       % allow Latin1 characters

% use initals dropped caps - doesn't work with PDF
%usepackage{dropping}
 %usepackage[dvips]{dropping}

%usepackage{styles/shortoverview}
%----------------------------------------------------
%      Graphics and Hyperlinks
%----------------------------------------------------

%% check for pdfTeX
ifxpdftexversionundefined
 %% use PostScript graphics
 usepackage[dvips]{graphicx}
 usepackage[sc]{mathpazo}
 usepackage{listings}
usepackage[american]{circuitikz}
 DeclareGraphicsExtensions{.eps,.epsi}
 graphicspath{{figures/}{figures/review}}
 usepackage{siunitx}
 %% allow rotations
 usepackage{rotating}
 %% mark pages as draft copies
 %usepackage[english,all,light]{draftcopy}
 %% use hypertex version of hyperref
 usepackage[hypertex,hyperindex=false,colorlinks=false]{hyperref}
else %% reduce output size pdfcompresslevel=9
 %% declare pdfinfo
 %pdfinfo {
 %  /Title (my title)
 %  /Creator (pdfLaTeX)
 %  /Author (my name)
 %  /Subject (my subject    )
 %  /Keywords (my keywords)
 %}
 %% use pdf or jpg graphics
 usepackage[pdftex]{graphicx}
 DeclareGraphicsExtensions{.jpg,.JPG,.png,.pdf,.eps}
 graphicspath{{figures/}}

 %% Load float package, for enabling floating extensions
 usepackage{float}

 usepackage{amssymb,
    amsfonts}

 %% allow rotations
 usepackage{rotating}
 %% use pdftex version of hyperref
 usepackage[pdftex,colorlinks=true,linkcolor=black,citecolor=black,%
 anchorcolor=black,urlcolor=black,bookmarks=true,%
 bookmarksopen=true,bookmarksopenlevel=0,plainpages=false%
 bookmarksnumbered=true,hyperindex=false,pdfstartview=%
 ]{hyperref}
%
%usepackage[pdftex,colorlinks=false,linkcolor=red,citecolor=red,%
% anchorcolor=red,urlcolor=red,bookmarks=true,%
% bookmarksopen=true,bookmarksopenlevel=0,plainpages=false%
% bookmarksnumbered=true,hyperindex=false,pdfstartview=%
% ]{hyperref}
fi

% Spacing reduce
usepackage[compact]{titlesec}
% titlespacing{section}{0pt}{2ex}{-1ex}
%titlespacing{subsection}{0pt}{0ex}{-1ex}
%   titlespacing{subsubsection}{0pt}{0.5ex}{-0.5ex}
%%

%    titleformat{chapter}[display]
%   {normalfonthugebfseries}{chaptertitlename thechapter}{20pt}{Huge}

%titlespacing{chapter}{0pt}{*4}{*1.5}

usepackage{apacite}
bibliographystyle{apacite}

Code for the main file (main.tex) as as follows:

 % The main file for CAMP reports
 % Don't put any content in here.
 % Don't even include content files by using input or inlcude.
 % Put your content to TEXT.TEX or include it there using input.
 % Uses:
 %      SETTINGS.TEX    contains the settings for this document
 %      COMMANDS.TEX    contains commands which can be used while writing
 %      INFO.TEX            contains the author, title and so on for the cover
 %      COVER.TEX           formats the front cover of the document
 %      ABSTRACT.TEX    contains the abstract to be included (if needed)
 %      TEXT.TEX            contains the actual content of the document
 %      BIB.BIB             containt the BibTeX entries for the document


%% Draft document mode
documentclass[12pt,a4paper,bibtotoc,idxtotoc,headsepline,footsepline,footexclude,BCOR12mm,DIV13,openany]{scrbook}



%documentclass[11pt,a4paper,bibtotoc,idxtotoc,headsepline,footsepline,footexclude,BCOR20mm,DIV10]{scrbook}

% KOMA-Optionen:
%  bibtotoc: include bibliography in table of contents
%  idxtotoc: include index in table of contents
%  headsepline: use horizontalline under heading
%  BCOR: binding correcion (Bindungskorrektur) (e.g.: BCOR5mm)
%  DIV: Number of sheet sections (used for layout) (e.g.: DIV12)

% include title and author information for the cover
input{components/info}

% include settings
input{components/settings}

% include commands
input{components/commands}


makeglossary
%linespread{1.25}

begin{document}

    frontmatter
    
    
    input{components/titlepage}
    
    %line Spacing
          onehalfspacing

           % no indentation
            parindent 0pt

    input{components/disclaimer}
    
    input{components/acknowledgements}
    
    input{components/abstract}
     linespread{1.25}
    tableofcontents
    listoffigures
    listoftables

  %input{components/outline}

    mainmatter
    
    
        % ---------------------------------------------------------------------------
        %
        %Introduction
        %
        % ---------------------------------------------------------------------------
       % doublespacing
           %paragraph spacing
             parskip 1.5ex
        linespread{1.5}
    
        input{chapters/chapter1}
        
        input{chapters/chapter2}
        
        input{chapters/chapter3}
        
        input{chapters/chapter4}
        
        input{chapters/chapter5}
        
        
        
        % ---------------------------------------------------------------------------
        %
        % Appendix
        %
        % ---------------------------------------------------------------------------
        
        %part*{Appendix}
    %   addcontentsline{toc}{part}{Appendix}
        
    %   appendix %---------------------------------------
        
        %input{chapters/oneAppendix}
        

  clearemptydoublepage
  linespread{1.25}
    %bibliography{reference/myrefs}

end{document}

Code for the first chapter (chapter 1) is as follows:

chapter{Introduction}
label{chapter1:Introduction}
 According to survey research conducted by Wangcite{chisholm2005compack} around 1.7MB of data is being generated every day around the world. This survey report expresses the importance of text mining and sentiment analysis in our daily life.

section{My heading}
text under my heading. 

Code for the bib file (myrefs.bib) is as follows:

@article{chisholm2005compack,
  title={COMPACK: a program for identifying crystal structure similarity using distances},
  author={Chisholm, James Alexander and Motherwell, Sam},
  journal={Journal of applied crystallography},
  volume={38},
  number={1},
  pages={228--231},
  year={2005},
  publisher={International Union of Crystallography}
}

When, I run the code I found following error:

! Missing number, treated as zero.
} l.5 section{My heading}

After removing section{My heading}, I found the following error.

! Missing number, treated as zero.
} l.1 begin{thebibliography}{}

After removing the bibliography{reference/myrefs}, The code works well.
Whaty should I do ? Can anybody tell me?

documentclass{scrbook}
usepackage[compact]{titlesec}
begin{document}
section{My heading}
end{document}

! Missing number, treated as zero.
<to be read again> 
                   }
l.4 section{My heading}
                        
?