I write the shortest code I can to cite and print bibliographies on Texmaker and texLive2020 as shown.
\documentclass{article}
\usepackage[backend=biber, style=apa, sorting=nty]{biblatex}
\addbibresource{citations.bib}
\begin{document}
read \cite{marcus}.
\printbibliography
\end{document}
with its respective citations.bib file.
@book{marcus,
author={Mitchell P. Marcus},
title={Switching circuits for engineers},
year={1975},
publisher={Prentince hall}}
But I always get the message "Empty bibliography" and a document without my bibliography.
I show a screenshot of some things that I have done. I have run the console and typed biber file. I have changed Bib(la)tex to bibtex biber bibtex.exe biber.exe bibtex8.exe bibtexu.exe all in its respective "C:/texlive/2020/bin/win32/biber.exe" % directory.
I really don't want to use \begin{thebibliography}{9}\bibtem{m..} because my bibliography can be to extensive and repetitive in some of my documents where I really could use this simplifying tool (that is why I use latex). I've been days struggling with this, I would really appreciate your help. Thanks in advance.

latex > biber >latex (twice)? – Bernard Dec 31 '20 at 00:01biber filemany times. – emma97 Dec 31 '20 at 00:20.blgfile (the log file for bibliographies). – Bernard Dec 31 '20 at 00:27.blgfile was created and following the necesary compilation order my bibliography is finally printed. Thank you very much, I appreciate your time. – emma97 Dec 31 '20 at 01:10.texfile. If you change that by using a 'build' subdirectory, many tools will need additional help to figure out where their configuration files are. Some might be completely unable to deal with such a situation. – moewe Dec 31 '20 at 07:59