I took the template from rsc.org and adjusted it for the needs recommended for this work. Now, extsizes makes trouble, so I excluded it with every line referring to it. natbib was also troubling around, so I replaced it with biblatex which normally doesn't make any trouble in my documents.
\documentclass[a4paper,twoside,twocolumn,9pt]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage[ngerman]{babel}
\usepackage{lmodern}
\usepackage{ngerman}
\usepackage{lipsum}
\usepackage{csquotes}
\usepackage{extsizes}
\usepackage[left=18mm,right=18mm,top=47mm,bottom=25mm]{geometry}
\usepackage{balance}
\usepackage{times,mathptmx}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{gensymb}
\usepackage{textcomp}
\usepackage{sectsty}
\usepackage[usenames,dvipsnames]{xcolor}
\usepackage{graphicx}
\usepackage{graphics}
\usepackage[pdf]{pstricks}
\usepackage{pdfpages}
\usepackage{background}
\usepackage{everypage}
\usepackage{lastpage}
\usepackage[format=plain,justification=justified,singlelinecheck=false,font={stretch=1.125,small,sf},labelfont=bf,labelsep=space]{caption}
\usepackage{lipsum}
\usepackage{float}
\usepackage{fancyhdr}
\usepackage{fnpos}
\usepackage{array}
\usepackage{droidsans}
\usepackage{charter}
\usepackage{setspace}
\usepackage[compact]{titlesec}
\usepackage[style=numeric,sorting=none,backend=bibtex8]{biblatex}
\addbibresource{sources.bib}
\usepackage[hidelinks]{hyperref}
\usepackage[all]{hypcap}
\definecolor{cream}{RGB}{222,217,201}
\backgroundsetup{scale=1,angle=0,opacity=1,color=black,contents={\begin{tikzpicture}[remember picture, overlay]
\node at ([xshift=-10cm,yshift=-19mm] current page.north east)
{\includegraphics[width=\paperwidth]{headerfile}};
\end{tikzpicture}}}
\title{my title}
\author{me}
\date{\today}
\begin{document}
\renewcommand{\figurename}{Abb.~}
\renewcommand{\tablename}{Tab.~}
\pagestyle{fancy}
\makeFNbottom
\makeatletter
\renewcommand\LARGE{\@setfontsize\LARGE{15pt}{25}}
\renewcommand\Large{\@setfontsize\Large{12pt}{17}}
\renewcommand\large{\@setfontsize\large{10pt}{14}}
\renewcommand\footnotesize{\@setfontsize\footnotesize{7pt}{10}}
\setcounter{secnumdepth}{5}
\renewcommand\@biblabel[1]{#1}
\renewcommand\@makefntext[1]{\noindent\makebox[0pt][r]{\@thefnmark\,}#1}
\makeatother
\sectionfont{\sffamily\Large}
\subsectionfont{\normalsize}
\subsubsectionfont{\bf}
\setstretch{1.125}
\setlength{\skip\footins}{0.8cm}
\setlength{\footnotesep}{0.25cm}
\setlength{\jot}{10pt}
\titlespacing*{\section}{0pt}{4pt}{4pt}
\titlespacing*{\subsection}{0pt}{15pt}{1pt}
\fancyhf{}
\include{titlepage}
\newpage\pagenumbering{arabic}
\renewcommand{\headrulewidth}{0pt}
\lfoot{name of subject -- 2018}
\rfoot{shortname, 2018, \textbf{subtopic 1}| \thepage}
\renewcommand{\footrulewidth}{1pt}
\setlength{\arrayrulewidth}{1pt}
\setlength{\columnsep}{6.5mm}
\setlength\bibsep{1pt}
\newlength{\figrulesep}
\setlength{\figrulesep}{0.5\textfloatsep}
\newcommand{\topfigrule}{\vspace*{-1pt}\noindent{\color{cream}\rule[-\figrulesep]{\columnwidth}{1.5pt}}}
\newcommand{\botfigrule}{\vspace*{-2pt}\noindent{\color{cream}\rule[\figrulesep]{\columnwidth}{1.5pt}}}
\newcommand{\dblfigrule}{\vspace*{-1pt}\noindent{\color{cream}\rule[-\figrulesep]{\textwidth}{1.5pt}}}
\twocolumn[\begin{@twocolumnfalse}
% \vspace{3cm}
\sffamily
\LARGE{\textbf{Our topic we're writing about}}\\
\vspace{0.3cm}\\
\large{me, the author}\\
\normalsize{some introduction - \lipsum[1]}\\
\end{@twocolumnfalse} \vspace{0.6cm}]
\renewcommand*\rmdefault{bch}\normalfont\upshape
\rmfamily
\section*{}
\vspace{-1cm}
\section*{theory}
\lipsum[2]\\one\cite{papere}, two\cite{paperz}, three\cite{paperd}, four\cite{paperv}
\paragraph*{first subtopic}
picture here (Abb.~\ref{pic})
\begin{figure}[!h]\centering
\includegraphics[width=0.6\columnwidth]{example}
\caption{picture.\cite{papere}.}\label{pic}
\end{figure}
\section*{what we did and how}
\lipsum[3].
\subsection*{nice title 1}
\lipsum[4]
\subsection*{nice title 2}
\lipsum[5]
\section*{data and discussion}
\lipsum[6]
\subsection*{disc. 1}
some text\cite{paperz}.\\
some text (Tab.~\ref{asdf}) for writing. bla bla bla lorem ipsum dolor et piscit.
\begin{table}[!h]\small
\centering
\caption{fac animalia ad trahit.}\label{asdf}
\begin{tabular}{l|cccc}
value&no 1&no 2&no 3\\ \hline
v\textsubscript{max}&1&2&3\\
v\textsubscript{max}&4&5&6\\
\end{tabular}
\end{table}
\section*{ending}
\lipsum
% \bibliography{sources} %You need to replace "rsc" on this line with the name of your .bib file
% \bibliographystyle{rsc} %the RSC's .bst file
\vspace{2cm}
\printbibliography
\end{document}
I know that there may be packages having the need to be included before specific others. Could it be that I just got "the wrong" order for my packages used?
My sources.bib, which gives me output shown after:
@ARTICLE{papere,
title={Synthesis of some polymer via some Polymerization and Its Evaluation in some field},
author={Bugnon, Lucienne; Morton, Colin J. H.; Novak, Petr; Vetter, Jens; Nesvadba, Peter},
journal={chemistry},
year={2000},
volume={100},
pages={1234--5678},
number={1},
}
@ARTICLE{paperz,
title={Improved Synthetic Procedure and Molecular Weight Control},
author={Neef, C. J.; Ferraris, J. P.},
journal={matter},
year={2000},
volume={100},
pages={1234--5678},
number={7},
}
@ARTICLE{paperd,
title={Synthesis of some polymer via some Polymerization and Its Evaluation in some field},
author={Lucienne Bugnon, Colin J. H. Morton, Petr Novak, Jens Vetter, Peter Nesvadba},
journal={chemistry},
year={2000},
volume={100},
pages={1234--5678},
number={1},
}
@ARTICLE{paperv,
title={Improved Synthetic Procedure and Molecular Weight Control},
author={C. J. Neef; J. P. Ferraris},
journal={matter},
year={2000},
volume={100},
pages={1234--5678},
number={7},
}
The output is from an earlier file version without that problem, but with a wrong citation "in exchange".
1 P. N. J. V. P. N. Lucienne Bugnon, Colin J. H. Morton,
Chem. Mater., 2007, 19, 2910–2914.
2 C. J. N. J. P. Ferraris, Macromolecules, 2000, 33,
2311–2314.
.logfile? – moewe Mar 27 '18 at 10:38\usepackage{ngerman},\usepackage[ngerman]{babel}already gives you German localisation. The length\bibsepis unknown, so you need to delete the line\setlength\bibsep{1pt}. We also don't have yourheaderfile. And you seem to have a few\\that are inappropriate. – moewe Mar 27 '18 at 10:41.bibfile input is also wrong. Names must be separated withandand not with commas or semicolons regardless of the desired output. See https://tex.stackexchange.com/q/36396/35864 – moewe Mar 27 '18 at 10:54\begin{document}is marked as undefined. – Nepumuk Mar 27 '18 at 14:41\begin{document}. Did you remove\usepackage{ngerman}? I could get your MWE to work with the changes mentioned in my answer. But really even the small bits of your document that you have shown us is a terrible mess. You should seriously consider starting anew. Since you seem to read German, have a look at https://komascript.de/latexvorlage – moewe Mar 27 '18 at 14:45\begin{document}was marked as undefined;\setlength\bibsep{1pt}seems to need another package. I commented it out and now everything works just fine. – Nepumuk Mar 27 '18 at 14:59\bibsepis unknown, so you can't redefine it." – moewe Mar 27 '18 at 14:59