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I've checked out the other answers to this apparently common question, but none work for me.

My use of Biblatex was working before, but now I get this error message. I've cleared the cache, but to no avail. I've added [backend=biber] but that didn't help either.

My code is like this:

\documentclass[12pt]{article}

\usepackage[backend=biber, style=nature]{biblatex}
\addbibresource{References.bib}


\title{IIB Project: Roadmap to Zero Emissions in a Cambridge College}
\author{Candidate 5557G}


\begin{document}


\cite{PMSpeech}


\printbibliography
\end{document}

In a file called References.bib:

@online{PMspeech,
  author = {UK Government},
  title = {Prime Minister's statement on coronavirus (COVID-19): 23 March 2020},
  year = "2020",
  url = {https://www.gov.uk/government/speeches/pm-address-to-the-nation-on-coronavirus-23-march-2020},
  urldate = {2022-05-25}
}
TBream
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    Then you need to prepare an example that generates that message. With what you have provided here we cannot recreate the problem. – daleif May 30 '22 at 11:23
  • Thanks, I'm new to this. I've updated now to include what I think should be sufficient code. – TBream May 30 '22 at 12:20
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    If you are having trouble with your bibliography, the .blg file is usually a very useful resource. It is the Biber log file and contains warnings and error messages about your .bib file. On Overleaf you can download the file as described in https://tex.stackexchange.com/q/462314/35864 for the .bbl. The .blg file is a simple text file that can be opened with any text editor (Windows might want to tell you that the .blg file is a performance monitor file and may not suggest you open it with a text editor - in this instance Windows is wrong). – moewe May 30 '22 at 15:06
  • Bro I wish you had added this as an answer instead of as a comment; you were totally right! The blg file was easy to read and explained that I had made a syntax error. Fixing this gave my references back ^.^ – TBream May 31 '22 at 19:41

2 Answers2

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When I run your example through biber I get (via TeXLive 2022)

Biber warning: [173] Biber.pm:130> WARN - Possible typo (case mismatch) between citation and datasource keys: 'PMSpeech' and 'PMspeech' in file 'file.bib' 
Biber warning: [173] Biber.pm:130> WARN - I didn't find a database entry for 'PMSpeech' (section 0)

In your .bib file you define PMspeech (lower case s) but you cite \cite{PMSpeech}. Case matters.

daleif
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  • As you can see comments are not for code, please add this as an addendum to your question, don't delete the rest, otherwise my answer makes no sense. – daleif May 30 '22 at 13:10
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The answer: I had made a syntax error in the References.bib file. This broke the whole thing.

Solution: Download the .blg file and read it in a text editor. I'm on a chromebook and use Simple. More help here:(tex.stackexchange.com/q/462314/35864).

This file explained where my error was, and fixing it brought back the references. I had to run through this process a few times since I had made a few errors, but each .blg file only shows one of them.

TBream
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