LaTeX Beginner's Guide ⇒ Undefined Reference Outpout and no bibliography besides having a bib-file

[luc_hoef2]

Hello everybody

I am fairly new to LaTex and face a problem regarding BibLaTex-file. As a compiler, I am using OverLeaf.

Please see the main.tex code below. In addition to that I have got a bib-file named "Literaturverzeichnis.bib" that contians the sources for my thesis.

For citing, I am using

Code: Select all

\cite{}

.
Unfortunately, when compiling neither quoating works nor is there any literature overview at the end of the document. It should be like: "... bla bla bla (Smith, 2019) bla bla bla..."

Is there a mistake regarding the main.tex code?

Thanks in advance, help is much appreciated!

Code: Select all

\documentclass[10pt]{tudscrreprt}

\usepackage[utf8]{inputenc}

\usepackage{makeidx}
\setcounter{secnumdepth}{3}

\usepackage{setspace}
\usepackage{geometry}

\usepackage[center]{caption}
\usepackage{graphicx}
\graphicspath{ {./Bilder/} }
\usepackage{subcaption}
\usepackage{float}

\usepackage{ verbatim}
\usepackage{tikz}
\usepackage{pgf}
\usepackage{pifont}
\usepackage{longtable}

\usepackage{lipsum}
\usepackage{subcaption}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{siunitx}
\sisetup{locale=DE}

\usepackage[english, ngerman]{babel}
\usepackage{csquotes}

\usepackage[style=apa]{biblatex}
\addbibresource{Literaturverzeichnis.bib}
\addbibresource{Bilderverzeichnis.bib}
\usepackage{tocloft}

\usepackage{xcolor}
 	\definecolor{TU_blau}{RGB}{0,48,94}
 
\usepackage{pdfpages}

\setlength{\parindent}{0mm}
\setlength{\parskip}{2mm}

\PassOptionsToPackage{hyphens}{xurl}
\usepackage{hyperref}
\usepackage[hyphens]{xurl}

\title{Diplomarbeit}
\author{ }
\date{August 2024}


\begin{document}


\pagenumbering{Roman}
\input{00_Deckblatt}
\addtocounter{page}{-1}


\newpage 
\thispagestyle{empty}
\quad \addtocounter{page}{-1}
\newpage

\tableofcontents
\clearpage 

\addcontentsline{toc}{chapter}{Thesen zur wissenschaftlichen Arbeit}
\input{06_Thesen}
\clearpage


\newpage
\addcontentsline{toc}{chapter}{Symbolverzeichnis}

\newpage
\addcontentsline{toc}{chapter}{Abkürzungsverzeichnis}
\input{05_Abkürzungsverzeichnis}

\newpage
\addcontentsline{toc}{chapter}{Abbildungsverzeichnis}
\listoffigures

\newpage
\pagenumbering{arabic}

\input{01_Einleitung} 
\newpage
\input{02_Hauptteil}
\newpage
\input{03_Fazit}

\printbibliography[title=Literatur]

\end{document}