apacite error - The style file: apacite.bst Database file #1: ... is a string literal, not a function

Question

I am trying to use the apacite package for referencing however I am having some problems getting it to work.

I am using Ubuntu and the Tex Live distribution so I installed the texlive-bibtex-extra Ubuntu package which contains apacite.

I am using a bibtex file that works fine with natbib but for some reason does not work here. Jung2009 is one of my references.

Here is an example:

\documentclass[11pt,a4paper,oldfontcommands]{memoir}

\usepackage{apacite}

\begin{document}

example example example \cite{Jung2009}. 

\bibliographystyle{apacite}%{unsrt}
\bibliography{library}

\end{document}

I initially had problems with citing in captions but solved that by placing \protect in front of the \cite commands.

However I still get the following error when I try to compile

This is BibTeX, Version 0.99d (TeX Live 2013/Debian)
The top-level auxiliary file: apa_practice.aux
The style file: apacite.bst
Database file #1: library.bib
apacite.bst [2013/07/04 v6.02 APA bibliography style]
"" is a string literal, not a function, for entry Jung2009 while executing---line 5144 of file apacite.bst
(There was 1 error message)

EDIT: My .bib file is automatically generated from my reference manager Mendeley. Here is the input for Jung2009.

@article{Jung2009,
abstract = {...},
author = {Jung, Christian and M\"{u}ller, Andreas E},
doi = {10.1016/j.tplants.2009.07.005},
file = {:home/geff/Documents/Mendeley Files/Jung and Muller.pdf:pdf},
issn = {1878-4372},
journal = {Trends Plant Sci.},
keywords = {...},
month = oct,
number = {10},
pages = {563--73},
pmid = {19716745},
title = {{Flowering time control and applications in plant breeding.}},
url = {http://www.ncbi.nlm.nih.gov/pubmed/19716745},
volume = {14},
year = {2009}
}

EDIT2: by running apacite.ins in the folder with my .tex file I can get apacite to run and the above example works great. However now every citation in my real document causes an !Undefined Control Sequence Error. Even when I delete all other related files in the folder. Could it be other packages interfering? Here is my preamble, based off a template:

\documentclass[11pt,a4paper,oldfontcommands]{memoir}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{microtype}
\usepackage[dvips]{graphicx}
\usepackage{xcolor}
\usepackage{times}
\usepackage{parskip}
\usepackage{wrapfig}
\usepackage{tcolorbox}
\usepackage{lipsum}
\usepackage{subfig}
\usepackage[format=hang]{caption}
%\usepackage{cite}
\usepackage{apacite}


\usepackage[
breaklinks=true,colorlinks=true,
linkcolor=black,urlcolor=black,citecolor=blue,
bookmarks=true,bookmarksopenlevel=2]{hyperref}

\usepackage{geometry}

\geometry{total={210mm,297mm},
left=20mm,right=20mm,
bindingoffset=10mm, top=25mm,bottom=25mm}

\OnehalfSpacing
%\linespread{1.3}

%%% CHAPTER'S STYLE
\chapterstyle{brotherton}
%%% STYLE OF SECTIONS, SUBSECTIONS, AND SUBSUBSECTIONS
\setsecheadstyle{\Large\bfseries\sffamily\raggedright}
\setsubsecheadstyle{\large\bfseries\sffamily\raggedright}
\setsubsubsecheadstyle{\bfseries\sffamily\raggedright}


%%% STYLE OF PAGES NUMBERING
\pagestyle{plain}
\makepagestyle{plain}
\makeevenfoot{plain}{\thepage}{}{}
\makeoddfoot{plain}{}{}{\thepage}
\makeevenhead{plain}{}{}{}
\makeoddhead{plain}{}{}{}


\maxsecnumdepth{subsection} 
\maxtocdepth{subsection}

Any help is greatly appreciated.