Secuencia de control Indefinido. \end Biblatex

Question

Estoy usando Biblatex pero al compilar el documento me aparece el error

Secuencia de control Indefinido. \end Actualicé todos los paquetes en MikTeX pero nada cambió. Cambié la configuración de Biber a Bibtex pero luego genera errores diferentes y solicita usar biber. Estoy usando un archivo bibtex generado por mendley como referencia.

A continuación se proporciona un ejemplo de trabajo mínimo:

\documentclass[USenglish,12pt,a4paper]{article}
\usepackage{microtype}
\usepackage{graphicx}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{float}
\usepackage{url}\usepackage{microtype}
\usepackage{graphicx}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{amsmath}
\usepackage{float}
\usepackage{url}
\usepackage[backend=biber,style=apa,citestyle=authoryear,
 bibstyle=apa,natbib=true]
{biblatex}
\addbibresource{library.bib}

\begin{document}
\section{Introduction}
The section is introduced by \cite{BCBS2016}. This section provides the necessary details of introduction \citep{}.

\printbibliography
\end{document}

Aquí se colocan dos entradas proporcionadas en el archivo dorsal:

@techreport{BCBS2016,
 address = {Basel},
author = {BCBS},
booktitle = {Basel III Document},
institution = {Basel Committee on Banking Supervision},
isbn = {9291313734},
 number = {July},
publisher = {Bank for International Settlements},
title = {{Revision to the secuitisation framework}},
url = {http://www.bis.org/bcbs/publ/d374.pdf},
year = {2016}
}

@article{Chiesa2008,
author = {Chiesa, Gabriella},
doi = {10.1016/j.jfi.2008.07.003},
file = {:C$\backslash$:/Users/Ahmed Arif/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Chiesa - 2008 - Optimal credit risk transfer, monitored finance, and banks.pdf:pdf},
isbn = {1042-9573},
issn = {10429573},
journal = {Journal of Financial Intermediation},
keywords = {Credit risk transfer,Monitoring incentives,Prudential regulation},
number = {4},
pages = {464--477},
title = {{Optimal credit risk transfer, monitored finance, and banks}},
volume = {17},
year = {2008}
}

Answer 1

Te olvidas de cargar babel. Y el idioma debería llamarse american.

\begin{filecontents*}{\jobname.bib}
@techreport{BCBS2016,
  address = {Basel},
  author = {BCBS},
  booktitle = {Basel III Document},
  institution = {Basel Committee on Banking Supervision},
  isbn = {9291313734},
  number = {July},
  publisher = {Bank for International Settlements},
  title = {{Revision to the secuitisation framework}},
  url = {http://www.bis.org/bcbs/publ/d374.pdf},
  year = {2016}
}

@article{Chiesa2008,
  author = {Chiesa, Gabriella},
  doi = {10.1016/j.jfi.2008.07.003},
  file = {:C$\backslash$:/Users/Ahmed Arif/AppData/Local/Mendeley Ltd./Mendeley Desktop/Downloaded/Chiesa - 2008 - Optimal credit risk transfer, monitored finance, and banks.pdf:pdf},
  isbn = {1042-9573},
  issn = {10429573},
  journal = {Journal of Financial Intermediation},
  keywords = {Credit risk transfer,Monitoring incentives,Prudential regulation},
  number = {4},
  pages = {464--477},
  title = {{Optimal credit risk transfer, monitored finance, and banks}},
  volume = {17},
  year = {2008}
}
\end{filecontents*}

\documentclass[american,12pt,a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage{amsmath}
\usepackage{microtype}
\usepackage{graphicx}
\usepackage{amsmath}
\usepackage{url}
\usepackage[
  backend=biber,
  style=apa,
  citestyle=authoryear,
  bibstyle=apa,
  natbib=true
]{biblatex}
\addbibresource{\jobname.bib}
\DeclareLanguageMapping{american}{american-apa}

\begin{document}
\section{Introduction}
The section is introduced by \cite{BCBS2016}. This section provides the 
necessary details of introduction \citep{Chiesa2008}.

\printbibliography
\end{document}

Notas

Solía filecontents*​​simplemente no dañar mis archivos y hacer un ejemplo autónomo. Utilice su propio library.bibarchivo para su documento.

Eliminé los paquetes que cargaste dos veces y reorganicé un poco el preámbulo.