Package natbib error: Bibliography not compatible with author year citation

LaTeX error message upon build:
Natbibbibliography not compatible with author year citation
In my case this was caused by a missing year entry in a bib-entry in Mendeley. This caused something along these lines in bibliography.aux (important is the last line missing a year column):
\bibcite{Wurman.2000}{{27}{2000}{{Wurman}}{{}}}
\bibcite{Wurman2001}{{28}{2001}{{Wurman et~al.}}{{}}}
\bibcite{Xerox2008}{{29}{{Xerox Corporation}}{{}}}
The second cause might be, that your bibliography file contains special characters and isnt correctly UTF8 encoded.
So you have basically 2 options here:
Either manually solve itĀ in the bibliography file
  • add the missing year to whatever bib entry is missing that datum (either directly in the .bib file or indirectly in jabref or e.g. mendeley)
  • make sure special characters in the file are encoded using UTF8
  • clear your bibliography.aux file
  • rebuild
Or change theĀ citation style
  • change \usepackage{natbib} to \usepackage[numbers]{natbib}
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