# Undefined control sequence!? [closed]

I'm new to LaTEX. My document was compiling completely fine. I added \usepackage{biblatex}, compiling failed. So deleted the biblatex package and tried again, but now my compiling failed again. I don't know whats happened, surely if my text was exactly the same as before it should run?

Here is my pre-document

 \documentclass[12pt]{article}


Here is my document. If it helps.

begin{document}

\begin{titlepage}

\newcommand{\HRule}{\rule{\linewidth}{0.5mm}}
\center
\textsc{\LARGE University of Manchester}\\[1.5cm]
\textsc{\Large School of Mathematics}\\[0.5cm]
\textsc{\large MMath Project}\\[0.5cm]
\textsc{\large MATH$40000$}\\[0.5cm]

\HRule \\[0.5cm]
{ \huge \bfseries Soft Tissues }\\[0.4cm]
\HRule \\[1.5cm]

\begin{minipage}{0.4\textwidth}
\begin{flushleft} \large
\emph{Author:}\\
Billy \textsc{Cole}
\end{flushleft}
\end{minipage}
~
\begin{minipage}{0.4\textwidth}
\begin{flushright} \large
\emph{Supervisor:} \\
Dr. William Parnell
\end{flushright}
\end{minipage}\\[2cm]

{\large \today}\\[2cm]
\vfill

\end{titlepage}

\tableofcontents
\clearpage

\begin{abstract}
abstract-text
\end{abstract}
\clearpage

\section{The Biology of Collagen}

\subsection{Collagen}
% PARAGRAPH
% intro to the abundance and importance within the body?
% into to, what actually is collagen?
% why is it in this thesis?

% PARAGRAPH
% more specific molecular structure of collagen.
% why this molecular structure makes it strong.

% PARAGRAPH
% hierarchy structure of collagen
% why this hierarchy structure makes it strong.
% include anisotropic properties.
% include

% PARAGRAPH
%

\subsection{Other Types of Tissue that Need to be Noted}

\subsection{How Collagen Works on the Chosen Soft Tissue}

% PARAGRAPH
% definitions of stress and strain
% and why

\subsection{Modelling Soft Tissues}

% PARAGRAPH
% the process of mathematical modelling

% PARAGRAPH
% intro to Linear Elasticity
% intro to Non linear Elasticity
% intro to Visoelasticity

\subsection{Extra Chapter}
% maybe on the ageing of collagen.

\clearpage
\section{The Mathematics}

\clearpage
\section{Modelling}

\clearpage
\section{Conclusion}

\clearpage
\section{Appendix}

\clearpage
\section{Bibliography}
%\begin{thebibliography}
%
%%\bibitem[lable]{marker}
%
%\end{thebibliography}

\end{document}


## closed as off-topic by Johannes_B, Stefan Pinnow, Torbjørn T., Werner, user13907 Oct 7 '16 at 11:27

• This question does not fall within the scope of TeX, LaTeX or related typesetting systems as defined in the help center.
If this question can be reworded to fit the rules in the help center, please edit the question.

• Welcome, horrible template for the title page. Better use the one from Wikibooks: en.wikibooks.org/w/index.php?title=LaTeX/… – Johannes_B Oct 7 '16 at 10:27
• A compilable document would be better to reproduce your error though i guess deleting the auxiliary files will do the job. – Johannes_B Oct 7 '16 at 10:28
• @Johannes_B, Cheers that worked, not sure why, but thank-you. – Billy Cole Oct 7 '16 at 10:33
• LaTeX writes information to auxiliary files that are read the next compile run. Sometimes, they need to be deleted to properly work again. It happens. – Johannes_B Oct 7 '16 at 10:36
• I'm voting to close this question as off-topic because there was some dodgy stuff in an auxiliary file. – Johannes_B Oct 7 '16 at 10:37