The warning message suggests that the 'hyperref' package is not recognizing "hidelinks=true" as a valid option. The hidelinks option does not take any value (true or false). It should be specified as a standalone option without =.
Here is an example:
\documentclass{article}
\usepackage[hidelinks]{hyperref}
\begin{document}
\title{Sample Document}
\author{Author Name}
\date{\today}
\maketitle
\section{Introduction}
This is a sample document with hyperref links hidden.
\end{document}