Please rerun biber?

Question

im using overleaf. Today when i logged into my document i had 100 yellow warnings, all for my references. the first warning reads:

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

How do i rerun biber?

My code is for bib is:

    \usepackage{url}
\usepackage[backend=biber,style=numeric,sorting=none]{biblatex}
\addbibresource{Kilder.bib}
´´´

 @online{traeinfo,
author = "Træinformation",
title = "kursusmateriale om clt",
url = "https://www.traeinfo.dk/kursusmateriale-om-clt/"
addendum = "Besøgt: 01.05.2020",,
keywords = "Træinformation"
}

Ive found the faulty reference. whenever i remove it, my document is fine. it gives an error in the addendum, but i cant see why?

Answer 1

The problematic entry

@online{traeinfo,
  author   = "Træinformation",
  title    = "kursusmateriale om clt",
  url      = "traeinfo.dk/kursusmateriale-om-clt"
  addendum = "Besøgt: 01.05.2020",,
  keywords = "Træinformation"
}

has two commas after the addendum field, but none after the url.

The contents of each field must be terminated with a comma ,. That comma can be omitted for the very last field of an entry. (Though I still recommend you include it even then.)

Make it read

@online{traeinfo,
  author   = "Træinformation",
  title    = "kursusmateriale om clt",
  url      = "traeinfo.dk/kursusmateriale-om-clt",
  addendum = "Besøgt: 01.05.2020",
  keywords = "Træinformation",
}

or even better

@online{traeinfo,
  author   = {Træinformation},
  title    = {kursusmateriale om clt},
  url      = {http://www.traeinfo.dk/kursusmateriale-om-clt/},
  urldate  = {2020-05-01},
  keywords = {Træinformation},
}

---

The answer to

How do I rerun Biber (on Overleaf)?

Is: You don't (– Overleaf does that automatically for you (by using the awesome latexmk). But a Biber run may not finish successfully or may not contain all cited references in case the are errors in your entries. So if you get a warning like

Package biblatex Warning: Please (re)run Biber on the file

on Overleaf, check the other warnings and messages listed in the warnings/error area and see if there is something pointing to Biber and your .bib files.

If your .bib file and your .tex file are free of errors, Overleaf will run LaTeX and Biber for you automatically as often as required until you get a stable output.

In very specific circumstances you may get stuck with nasty errors, in that case it may help to delete the cache and recompile from scratch, see https://overleaf.com/learn/how-to/Clearing_the_cache