LaTeX error message upon build:
<pre><code>Natbibbibliography not compatible with author year citation
</code></pre>
In my case this was caused by a missing year entry in a bib-entry in <a href="http://www.mendeley.com/">Mendeley</a>. This caused something along these lines in bibliography.aux (important is the last line missing a year column):
`
<pre><code>\\bibcite{Wurman.2000}{{27}{2000}{{Wurman}}{{}}}
\\bibcite{Wurman2001}{{28}{2001}{{Wurman et~al.}}{{}}}
\\bibcite{Xerox2008}{{29}{{Xerox Corporation}}{{}}}
</code></pre>
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 it in the bibliography file
<ul>
<li>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)</li>
<li>make sure special characters in the file are encoded using UTF8</li>
<li>clear your bibliography.aux file</li>
<li>rebuild</li>
</ul>
Or change the citation style
change
<pre><code>\\usepackage{natbib}
</code></pre>
to
<pre><code>\\usepackage\[numbers\]{natbib}
</code></pre>

Package natbib error: Bibliography not compatible with author year citation