I am on a Windows machine using:
Editor: TexStudio 3.1.1
Compiler: pdflatex
Bibliography tool: biber
Bibliography manager: natbib
Today, I was editing my thesis document (just the text at the time, no figures, no tables, no new packages, etc.) and I went to compile & view in order to check my changes in the PDF viewer and suddenly I started getting a "Missing 'biblatex' package" error. I have no idea what could have caused this and the best I can come up with is that it has to do with natbib. I don't really want to change my paper to use a different package and I also am just curious about how this happened.
Normally, I never get to the stage where I actually post a question because I find the problem while trying to get to a minimum reproducible example, but not this time. The error still occurs with the following:
\documentclass[10pt]{article}
\usepackage[authoryear]{natbib}
\title{Simple Example}
\begin{document}
Lorem ipsum...
\bibliographystyle{plain}
\bibliography{bibliography}
\end{document}
In fact, it's the only message in my log. No warnings or anything else. The log tells me that the error is in the .bbl file, but I'm pretty sure that is just the branch statement that checks for the presence of the biblatex package not the cause of the error.
I did not leave my computer or even close TexStudio between the last time it worked fine and when I started getting this error.
To troubleshoot: I have checked that biblatex is installed, I have updated MikTex, I have updated my package database through MikTek console (both as user and admin), I have updated TexStudio, I have checked that biblatex.cwl is checked in TexStudio config (not that it should matter for this), I have tried using a different editor (TexMaker), and I have tried walking back my changes since the last time it worked.
When I transfer everything to Overleaf it runs fine and, oddly, switching the bib manager from natbib to biblatex seems to work but it messes up my formatting. So, I suspect that there is something that my computer suddenly doesn't like about natbib but I cannot imagine what it might be at this point or why it happened so suddenly.
Any help would be much appreciated. Thank you.
EDIT: I also deleted the .bbl file and the .aux file between each troubleshooting step.
EDIT 2: Here is the logfile as requested in the comments.
This is pdfTeX, Version 3.141592653-2.6-1.40.22 (MiKTeX 21.6) (preloaded format=pdflatex 2021.6.9) 9 JUN 2021 02:58
entering extended mode
**./thesis.tex
(thesis.tex
LaTeX2e <2021-06-01>
L3 programming layer <2021-06-01> (ClemsonThesis.cls
Document Class: ClemsonThesis 2007/05/31 Version 1.0 by Andrew R. Dalton, Schoo
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! LaTeX Error: Missing 'biblatex' package.
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l.16 {}
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.bblfile and try again. (Also try the document shown in the question in a new, empty directory.) I think an error like this appears when the.bblfile was created forbiblatex(e.g. because the document usedbiblatexpreviously) but the document no longer usesbiblatex. If that does not help, please post the.logfile of the document that does not compile. – moewe Jun 09 '21 at 06:42natbib.natbibonly works with BIbTeX, so you need to switch back from Biber to BibTeX (follow https://tex.stackexchange.com/q/154751/35864) in reverse. (Although I can't reproduce the issue when I erroneously run Biber on your document: For Biber just complains, aborts processing immediately and does not start writing a.bblfile, which you seem to have hanging around.) – moewe Jun 09 '21 at 06:48Missing 'biblatex' package" erroris triggered by the.bblfile if it is loaded in a document that does not loadbiblatex. The check that is performed to trigger the error does not check ifbiblatexis installed on your system (which it most likely is), it really only checks ifbiblatexis loaded (which in the example it is not). This check is written to the.bblfile by Biber/BibTeX when they produce the.bblfile forbiblatex. In your example there should be absolutely no reason for Biber/BibTeX to do so. ... – moewe Jun 09 '21 at 06:55plain.bstand notbiblatex.bst. – moewe Jun 09 '21 at 06:56.bcffile between runs? If your editor erroneously calls Biber and a.bcffile is present from previous experiments/runs withbiblatex, Biber might run and produce a.bbl. Delete the.bcf(and.auxand.bblfor good measure) and tell your editor to run BibTeX, not Biber. – moewe Jun 09 '21 at 06:57.logfile does not come from the document you have shown (it uses a different document class and appears to be much longer), so it might be dangerous to draw conclusions from that file. For all I can see the problem is indeed a.bblfile written forbiblatex. I'd like to refer you to my three comments above: Delete the.aux,.bbland.bcf. Tell your editor to run BibTeX and not Biber. Then compile again. – moewe Jun 09 '21 at 07:05plainis not compatible withnatbib'sauthoryearoption. You'll need anatbibstyle (likeplainnat) ornatbib-compatible style for citations to actually come out as author-year citations. – moewe Jun 09 '21 at 07:10