Sstrhsrtj

During the last days I am really stressed because I face a problem with my References that I never had before. With the following, I try to generate my bibliography but I either get the error "providecommandNAT@force@numbers{}NAT@force@numbers", or I get my document with question marks instead of bibliography names/dates.

Any ideas how to spot the issue which causes me this and fix it?

here are my two .bib files

I do not want to use natbib with numbers but with names and I do not understand the reason why I have this issue. I read similar issues but I can not spot any missing dates on my files which previously were fine and that is why I am confused.

P.S. I show you all the packages that I use in case something else causes the problem.

RequirePackage{filecontents}

documentclass[12pt,a4paper]{article}

 listfiles

usepackage{amsthm}

usepackage{titling}

usepackage[utf8]{inputenc}

usepackage{tcolorbox}

usepackage{graphicx}

usepackage{lipsum}

usepackage{mwe}

usepackage{subfig}

usepackage{float}

%usepackage{cite}

usepackage[authoryear,round]{natbib}

%usepackage[numbers]{natbib}

usepackage{enumitem}

usepackage{amsmath}

usepackage{mathtools}

usepackage{multicol}

usepackage{stfloats}

usepackage{authblk}

usepackage{afterpage}

usepackage[T1]{fontenc}

%usepackage[hidelinks]{hyperref}

usepackage[colorlinks = true,

linkcolor = blue,

urlcolor  = blue,

citecolor = blue,

anchorcolor = blue]{hyperref}

usepackage{amsfonts}

usepackage{booktabs}

usepackage{fancyhdr}

usepackage{array}

usepackage{pdflscape}

usepackage{array,ragged2e,booktabs}

usepackage{tikz}

usepackage{longtable}

usepackage{capt-of}

usepackage{tabularx}

usepackage{textcomp}

usepackage{makecell}

usepackage[british]{babel}

usepackage[euler]{textgreek}

usepackage{makecell}

usepackage{xcolor,colortbl}



%usepackage{dirtytalk}

%usepackage[none]{hyphenat}

%hyphenation{sy-ner-gi-stic}

%usetikzlibrary{shapes.geometric, arrows}

pagestyle{fancy}



%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%fancyhf{}

lhead{}



makeatletter

defthanks#1{protected@xdef@thanks{@thanks

        protectfootnotetext{#1}}}

makeatother

renewcommandtabularxcolumn[1]{m{#1}}

definecolor{LightCyan}{rgb}{0.88,1,1}

definecolor{Burntsienna}{rgb}{0.91,0.45,0.32}



date{}



newcolumntype{C}{>{$displaystyle}c<{$}}

bibliographystyle{apalike}

setlist[enumerate]{label*=arabic*.}

begin{document}

        title{vspace{-3.0cm}rule{textwidth}{1pt}\title here \vspace{1.0cm}rule{textwidth}{1pt}\{Large Probation Report}}

    author{author herethanks{department here}}



    maketitle

    newpage

    tableofcontents

    newpage

    renewcommand{thesection}{arabic{section}}





    section{bla bla}

    bla bla bla bla  citep{holling_resilience_1973,gunderson_ecological_2000} bla bla bla  citep{gunderson_ecological_2000}. bla bla bla bla bla bla  citep{achard_areas_2006, alkama_biophysical_2016, appenzeller_new_2015, bergeron_ecosystem_2017, berner_plant_2013,brown_once_2012, chapin_global_2004, forkel_trend_2013, forkel_codominant_2015, furyaev_effects_2001, lucht_terrestrial_2006, rydgren_disturbance_2004, jasinski_creation_2005, soja_climate-induced_2007, scheffer_thresholds_2012, williams_who_2011, young_climatic_2017, vygodskaya_ecosystems_2007, tanja_air_2003}. 









newpage

section{References}

%nocite{*}

bibliography{fone,ftwo}

newpage

section{Supplementary material}



end{document}

In my experience, this error is caused by bibliographic references that are missing a year. Loading the bib files into JabRef and sorting by year should help you to identify the problematic entry.