I'm following the tutorial on overleaf to create a bibliography, yet I keep getting the error "Empty bibliography on input line...". Here's my code.
\documentclass[a4paper]{article}
\usepackage[backend=biber]{biblatex}
\addbibresource{sample.bib}
%%% Title Data
\title{Seminar}
\author{}
\date{November 28, 2019}
\begin{document}
\maketitle
{\centering
\LARGE\textbf{Nonshellable Triangulation of 3-balls}\par
}
\printbibliography
\end{document}
And the content of the .bib file:
@article{einstein,
author = "Albert Einstein",
title = "{Zur Elektrodynamik bewegter K{\"o}rper}. ({German})
[{On} the electrodynamics of moving bodies]",
journal = "Annalen der Physik",
volume = "322",
number = "10",
pages = "891--921",
year = "1905",
DOI = "http://dx.doi.org/10.1002/andp.19053221004",
keywords = "physics"
}
Also a screenshot of the window on overleaf I'm working on.
What am I doing wrong?

\citecommands? And, assuming the answer to the first question is "yes", did you runbiberfollowed by another round of LaTeX? – Mico Dec 10 '19 at 12:08\citein my draft! I didn't know that would cause the above problem. Thanks for pointing it out. – ensbana Dec 10 '19 at 12:24\nocite{*}. – Bernard Dec 10 '19 at 13:08\citeor\nocite{*}? In that case would you be OK with closing this question as a duplicate of https://tex.stackexchange.com/q/17128/35864. – moewe Dec 10 '19 at 17:28