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! LaTeX Error: Missing \begin{document}.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.1 \begin{thebibliography}{}

This is BibTeX, Version 0.99d (TeX Live 2015)
The top-level auxiliary file: Vorlage.aux
The style file: alphadin.bst
I found no \bibdata command---while reading file Vorlage.aux
Warning--I didn't find a database entry for "howi"
(There was 1 error message)

% -------------
% Präambel
% -------------

\documentclass[12pt,a4paper,ngerman,]{scrartcl}

% ------------------
% Pakete laden 
% ------------------

% -------------
% Schriftart
% -------------
\usepackage [T1]{fontenc}
\usepackage [utf8]{inputenc}
\usepackage {babel}
\usepackage{lmodern}

\usepackage{microtype}
%\setlength{\emergencystretch}{1em}

\usepackage[scaled]{helvet}

% ----------------------
% Seitengeometrie
% ----------------------
\usepackage{geometry}
\geometry{a4paper, top=27mm, left=30mm, right=20mm, bottom=35mm, headsep=10mm, footskip=12mm}

% -------------------------
%Chemie und Mathe
% -------------------------

\usepackage {siunitx}
\usepackage{chemformula}
\usepackage[version=4]{mhchem}

%------
% Links
%------

\usepackage {url}
\urlstyle{same}


\usepackage{mdwlist}
\usepackage{paralist}
\usepackage{graphicx} 
\usepackage{tabularx}


\usepackage{subfigure}

% ----------------------
%Literaturquellen
% ----------------------

\usepackage[babel, german=quotes]{csquotes}
%\usepackage[style=science]{biblatex}
\usepackage[super]{cite}  
\bibliography{Quellen}
\bibliographystyle{alphadin}

% ----------------------
% Nummerierung
% ----------------------

\setcounter{secnumdepth}{2}


% -----------------------------
% Tabellen und Grafiken
% -----------------------------

%Bildunterschriften
\usepackage{caption}
\usepackage[labelfont=bf,font={small,sf}]{caption} 
\addto\captionsngerman{\renewcommand{\figurename}{Abb.}}

%Für Tabellen:
%\addto\captionsngerman{\renewcommand{\tablename}{Tab.}



% -------------
% Kopfzeile
% -------------

\usepackage{scrlayer-scrpage}
%\usepackage[headtopline,headsepline]{scrlayer-scrpage}
%\setheadtopline{0,4pt}
%\setheadsepline{}

\clearscrheadfoot
\ihead{}
\ohead{14.06.2016}
\ifoot*{}
\ofoot{\pagemark}
\pagestyle{scrheadings}
\setkomafont{pageheadfoot}{\small}
\setkomafont{pagehead}{}

%\bfseries

\addto\captionsngerman{\renewcommand{\headfont}{\fontfamily{phv}\selectfont}}
%\renewcommand{\pnumfont}{\fontfamily{phv}\selectfont} 

%---------------------------------------------------------------------------------------------------------
% Dokument
%---------------------------------------------------------------------------------------------------------

\begin{document}

%\sloppy

%----------------------------------------------------------------------------------------------------------
% Titelseite
%---------------------------------------------------------------------------------------------------------

\thispagestyle{empty}
\large\normalfont Assistent (Datum, Unterschrift):
\vspace{2.0cm}
	\begin{center}
	\parbox{\linewidth}{\phantom{sdfdf}}
	\par
		\bfseries \huge Darstellung von ..
	\vspace{0.1cm}
		\normalfont \\ 
	\vspace{1.1cm}
		\bfseries\large Protokoll zum Anorganisch-Chemischen Grundpraktikum II:\\
	\vspace{0.1cm}
		Anorganische Präparate\\
	\vspace{0.1cm}
		(Modul chem0205)\\
	\vspace{1.1cm}
		\large\normalfont Unter der Anleitung von\\
	\vspace{0.1cm}
		\bfseries ... \\
	\vspace{1.1cm}
		\large\normalfont Bearbeitet und vorgelegt von\\
	\vspace{0.1cm}
		\bfseries und\\
	\vspace{0.1cm}
		\bfseries Gruppe \\
	\vspace{1.1cm} 
		series\textsc{...Universität..}\\
	\vspace{0.1cm}
		\bfseries SoSe
\end{center}
\pagebreak

%--------------------------
%Zusammenfassung
%--------------------------

\section{Zusammenfasung}

Test \cite{howi}

%------------
%Literatur
%------------

\printbibliography

%\theendnotes

\end{document}

\bibliography{Quellen}

%\printbibliography

\usepackage[babel, german=quotes]{csquotes}
\usepackage[super]{cite}  
\bibliographystyle{alphadin}