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Hi I'm trying to compile a project with pdflatex and am getting some errors with the bib

LaTeX Warning: Empty bibliography on input line 145.

[3] (./main.aux)

LaTeX Warning: There were undefined references.


Package biblatex Warning: Please (re)run Biber on the file:
(biblatex)                main
(biblatex)                and rerun LaTeX afterwards.

I'm a bit confused with this message since I've had no problems compiling projects with bibs in the past and recently trying to recompile old projects I get the same error. I tested the project on overleaf and it compiles just fine.

I don't get why I now need Biber what's wrong with biblatex?

This is a related discussion but I didn't find it helpful. How to (re)run Biber on the file

user2757771
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    that looks like the expected messages for a first run. You need to run latex then biber then latex again. (overleaf does that for you) – David Carlisle Jan 09 '20 at 00:53
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    Perhaps your editor is set up to run bibtex. Change the settings to run biber instead. (See https://tex.stackexchange.com/questions/154751/biblatex-with-biber-configuring-my-editor-to-avoid-undefined-citations) – David Purton Jan 09 '20 at 01:12
  • okay im just compiling in the terminal, do I have to install biber? Why has this worked in the past without it? – user2757771 Jan 09 '20 at 01:20
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    latex has never sorted a bibliography (ignoring amsrefs package for now) it has always relied on an external program (bibtex originally, or if using biblatex then biber) to be run after latex to sort the entries, after which you run latex again. If it was working before you must have been running bibtex or biber. You should have biber in your standard miktex or texlive already. – David Carlisle Jan 09 '20 at 01:28
  • @DavidCarlisle I'm using MacTex (BasicTeX) any idea where I can locate biber – user2757771 Jan 09 '20 at 03:00
  • So I just downloaded biber from here (https://sourceforge.net/projects/biblatex-biber/) put it in /usr/local/bin and ran pdflatex main biber main pdflatex main. – user2757771 Jan 09 '20 at 03:13
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    You don't need to install biber, it is already in your TeX distribution, like MiKTeX or TeX Live. – CarLaTeX Jan 09 '20 at 05:47
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    As David Carlisle says: With biblatex you always needed to run either Biber or BibTeX on your document. There is definitely no recent change there. (There was a change a few years back that made Biber the default choice over BibTeX, but that really was a while ago.) This is explained in more detail in https://tex.stackexchange.com/q/63852/35864. As CarLaTeX says: Never install Biber manually. It is either already included in your distribution or can easily be installed with tlmgr/TeX Live Utility/MikTeX Console. – moewe Jan 09 '20 at 06:15

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