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My preamble

\documentclass[12pt,a4paper]{report}
\usepackage[utf8]{inputenc}

\usepackage[english,greek]{babel}
%\usepackage[square, numbers, comma, sort&compress]{natbib}  % Use the "Natbib" style for the references in the Bibliography
\usepackage{verbatim}  % Needed for the "comment" environment to make LaTeX comments
\usepackage{biblatex}
\usepackage{amsmath,amsfonts,amssymb,amscd,mathrsfs,enumerate}
\usepackage{amsthm}
\usepackage{tikz}
\usetikzlibrary{matrix}
\usepackage[all]{xy}
\usepackage{relsize}
\usepackage{pifont}
\usepackage{mathtools}
\usepackage[all]{xy}
\usepackage{relsize}
%\usepackage{fourier}
\usepackage{esvect}
\usepackage{csquotes}
\usepackage{substitutefont}
\usepackage{graphicx}
\substitutefont{LGR}{\rmdefault}{artemisia}
\usepackage{pgf,tikz}
\usepackage{mathrsfs}
\usepackage{adjustbox}
\usepackage[capposition=top]{floatrow}
\renewcommand{\qedsymbol}{\textcolor{black}{$\blacksquare$}}
\allowdisplaybreaks
\usepackage{thmtools}

\useshorthands{;}
\defineshorthand{;}{?}


\usepackage{biblatex}
\addbibresource{bibl.bib}

then before the \end{document} I wrote

\nocite{*}
\printbibliography

but nothing appears (the bibliography does not appear) and I get an error "empty bibliography on imput line 616".

Any help?

enter image description here

Maybe this helps

enter image description here

[0] Config.pm:304> INFO - This is Biber 2.12
[0] Config.pm:307> INFO - Logfile is 'output.blg'
[43] biber:315> INFO - === Sat Oct 19, 2019, 07:04:29
[75] Biber.pm:371> INFO - Reading 'output.bcf'
[180] Biber.pm:886> INFO - Using all citekeys in bib section 0
[204] Biber.pm:4093> INFO - Processing section 0
[217] Biber.pm:4254> INFO - Looking for bibtex format file 'bibl.bib' for section 0
[219] bibtex.pm:1523> INFO - LaTeX decoding ...
[229] bibtex.pm:1340> INFO - Found BibTeX data source 'bibl.bib'
[255] bibtex.pm:94> FATAL - Caught signal: SEGV
Likely your .bib has a very bad entry which causes libbtparse to crash: Operation not permitted
1123581321
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    Did you run Biber? You need to compile your document with LaTeX, Biber, LaTeX, LaTeX (where LaTeX can be your favourite flavour of LaTeX: pdfLaTeX, XeLaTeX, LuaLaTeX). See https://tex.stackexchange.com/q/63852/35864 for a more in depth explanation. See https://tex.stackexchange.com/q/154751/35864 for help in getting your editor to run Biber for you. – moewe Oct 19 '19 at 07:23
  • @moewe Thank you! I write it online in overleaf. Do you know where I can see the compiler I use? – 1123581321 Oct 19 '19 at 07:30
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    Overleaf automatically runs Biber for you. In that case there must be an error somewhere. Download the .blg file (shown in https://tex.stackexchange.com/q/462314/35864 for the .bbl) and post its complete contents here. – moewe Oct 19 '19 at 07:32
  • When I open the file it seems empty, how can I post it here? – 1123581321 Oct 19 '19 at 07:37
  • It's a text file, even if Windows says it is a performance monitor file. Just open it with your favourite text editor. – moewe Oct 19 '19 at 07:41
  • Did I upload it right? – 1123581321 Oct 19 '19 at 07:49
  • Yup. The error does not look good and isn't particularly helpful. There must be something seriously wrong with your .bib file (my guess is an author field). Can you share your .bib file with us? – moewe Oct 19 '19 at 08:04
  • I did so (I write in greek so I use \textlatin) – 1123581321 Oct 19 '19 at 08:08
  • @moewe Thank you again. I found it. If you want write something as an answer to give you some points. – 1123581321 Oct 19 '19 at 08:40
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    Er, so what was the answer? – moewe Oct 19 '19 at 08:46
  • In the bibliograpfy file I had to write the shortnames of the books with the first letter capital – 1123581321 Oct 19 '19 at 09:45
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    Not sure if I understand correctly, but if you found the solution, please consider writing an answer below and accepting it so that other people can benefit from it as well. – moewe Oct 19 '19 at 10:21

1 Answers1

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I have same problem (via Overleaf). As a background, I migrated my bibliography from natbib to biblatex with the reference items over 300. As far as I understand, biblatex in Overleaf uses biber as a default?

Then I tried to use bibtex as its backend

\usepackage**[backend=bibtex]**{biblatex}, and magically it works!

Hope this helps.

stjertmeis
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