I am trying to compile "bibtex filename.aux" in latex. It does not compile and the errors are:

  1. Package natbib Error: Bibliography not compatible with author-year citations ...mand\NAT@force@numbers{}\NAT@force@numbers

  2. File ended while scanning use of \@@BOOKMARK \begin{document}

  3. File ended while scanning use of \@@BOOKMARK \begin{document}

The main problem is the first error. The command line with the problem in the filename.aux says: \providecommand\NAT@force@numbers{}\NAT@force@numbers (So apparently this is the line with a problem)

Here are the lines in the .tex file


text... \citep{author2002}...etc

I have no idea how to make it run. PLEASE HELP!!!

  • Can you prepare a minimal example MWE that lets us reproduce the problem? Right now there isn't enough information. FYI: biblatex is a modern alternative and could be of interest for you.
    – Johannes_B
    Commented Nov 28, 2013 at 9:33
  • Which bibliography style file are you using? Did you try loading natbib with the option authoryear?
    – Mico
    Commented Nov 28, 2013 at 9:47
  • In my case I was using TexStudio 2.9.4 and I resolved this same issue by looking carefully in Tools -> Bibliography, a log file about the bibliography compilation, and I resolved every issue it has warned me, like missing commas.
    – srodriguex
    Commented Apr 25, 2015 at 13:48

1 Answer 1


You haven't told us which bibliography style you use, but it would appear to be one that generates a numeric citation style by default.

If the bibliography style is not completely incompatible with authoryear-style citations (a big if, given the first error message you report...), you could try issuing the command


after loading natbib so that \citet and \citep can create citations in the desired authoryear style. After adding the command given above, be sure to wipe out the .aux file and rerun LaTeX, BibTeX, and LaTeX (twice more) .

If your bibliography style does turn out to be incompatible with authoryear-style citations, you either need to find another, compatible style file or create your own custom .bst style file from scratch. Fortunately, the latter method isn't as difficult as it might seem, thanks to the existence of the custom-bib package (which was created, incidentally, by the author of the natbib package).

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