[Tex/LaTex] xkeyval error: ‘defernums’ undefined in families

biblatexerrorsxkeyval

Relative noob in LaTeX, and I'm trying to adapt an existing (public) template (with attribution) to my own needs, and the first step is gutting all the project specific code and setting up the environment so it builds. But, I'm getting this error on build (with texclipse, but same with from console) with no specific line number 

Description Resource    Path    Location    Type
Package xkeyval Error: `defernums' undefined in families `blx@opt@pre'. \blx@processoptions (followed by: ) (Occurance: /usr/local/texlive/2011/texmf-dist/tex/latex/biblatex/biblatex.sty) thesis.tex  /mythesis   Unknown Texlipse Build Error

But I don't understand what's going wrong; this appears to be complaining about one of the texlive provided style files for biblatex… And I don't really want to be fiddling with those unless I know what I'm doing.

Anyone got any pointers?

The only section of my own custom sty file that deals with biblatex is 

%% biblatex
\usepackage[
  hyperref,backref,sortcites,
  defernums=true,
  date=short,
  bibencoding=inputenc,
  maxnames=3,
  minnames=2,
  firstinits=true,
  sorting=nyt,
  bibstyle=numeric,
  citestyle=numeric-comp,
]{biblatex}
\def\bibfont{\small}
\bibliography{journals,phd,library}
\renewcommand\bibname{References}

For the full sty see here, with the sample case consisting of 

\documentclass[11pt,a4paper]{memoir}
\usepackage{thesis-preamble}
%\includeonly{magnet-design}
\EndPreamble
\begin{document}
\title{helloworld}
\end{document}

Best Answer

As of version 0.9b, Biblatex renamed the defernums option to defernumbers

http://www.tex.ac.uk/CTAN/macros/latex/exptl/biblatex/RELEASE

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