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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} }
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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. Commented May 30, 2022 at 11:23
  • Thanks, I'm new to this. I've updated now to include what I think should be sufficient code. Commented May 30, 2022 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 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). Commented May 30, 2022 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 ^.^ Commented May 31, 2022 at 19:41

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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.

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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. Commented May 30, 2022 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.

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