GenericError  ...
                                                    #4  errhelp @err@     ...
l.12 ...ph1}{Matriz de rigidez de la estructura}{}
                                                  % 12
/Users/Isai/Documents/Maestria PUCP/Ingenieria Sismo Resistente/Tarea 3/Informe/.texpadtmp/Tarea 3.out:12: Undefined
control sequence.
GenericError  ...
                                                  let @err@               ...
l.12 ...ph1}{Matriz de rigidez de la estructura}{}

> Runaway text?
begingroup immediate write @unused   def MessageBreak
 let protect ETC.
./Tarea 3.tex:92: File ended while scanning text of begingroup.
<inserted text>

documentclass[12pt,a4paper]{article}

usepackage[spanish,es-noshorthands]{babel}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}
usepackage{mathptmx}

usepackage[title]{appendix}

usepackage{pdflscape}


begin{document}

section{New Story}

A written line %cite{chopra2001dynamics}.

%printbibliography

section{Another}

clearpage

begin{landscape}
    begin{appendices}
section{New story}
Hey
section{Other}
end{appendices}
end{landscape}