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

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\cite{}
 
 
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.
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

Code, edit and compile here:

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\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}
 
 
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