[Tex/LaTex] addcontentsline works for section but not for chapter

Question

I'm trying to add a new chapter to both the bookmarks in the PDF as well as the table of contents, without having the chapter appear on the page outside of the TOC. When I try this using \addcontentsline{toc}{chapter}{Chapter Title Here}, it gets an error and won't compile. Here's the code that errors:

\documentclass{article}
\usepackage{hyperref}
\usepackage{titlesec}

\begin{document}

\tableofcontents

\newpage

\phantomsection
\addcontentsline{toc}{chapter}{Chapter 1}

\section{First Section}

\end{document}

Interestingly, when I change chapter to section and section to subsection, everything works as I want, except that I want these to be at the chapter and section levels instead:

\documentclass{article}
\usepackage{hyperref}
\usepackage{titlesec}

\begin{document}

\tableofcontents

\newpage

\phantomsection
\addcontentsline{toc}{section}{Chapter 1}

\subsection{First Section}

\end{document}

Is there a way to fix the top example so that it works like the second example but with the desired levels?

Answer 1

The standard article class does not support the use of \chapters. Separation of \sections is typically achieved by using \parts:

\documentclass{article}
\usepackage{titlesec,hyperref}

\begin{document}

\tableofcontents

\newpage

\phantomsection
\addcontentsline{toc}{part}{Chapter 1}

\section{First Section}

\end{document}