Any idea what is the use of:
\usepackage[most]{tcolorbox}
in simple explanation?
This is because I need to include \usepackage[hypcap=false]{caption}, but it crash with \usepackage[most]{tcolorbox}.
I need to delete \usepackage[most]{tcolorbox}.
Why both are crash?
\documentclass[12pt,oneside]{book} % Remove draft option to show figures (for final draft), otherwise keep for faster production
\usepackage[most]{tcolorbox}
\usepackage{uorthesis} % Loads the LaTeX style package
\usepackage[backend=biber, style=authoryear]{biblatex}
\usepackage[demo]{graphicx}
\usepackage[hypcap=false]{caption}
\usepackage[list=true]{subcaption}
\begin{document}

\usepackage[demo]{graphicx}to your preamble. The error message is shown, sinceuorthesisalready loads thegraphicxpackage. If you want to use thedemooption, include it into the class options (´\documentclass[12pt, oneside, demo]{book}`). – leandriis Jan 01 '20 at 14:34subcaptionanduorthesisstill persists. Therefore, your MWE will still produce error messages, even after fixing what I mentioned in my previous comment. – leandriis Jan 01 '20 at 14:37\usepackage[demo]{graphicx}, it works. Can i know how you read the error message? I need to learn instead of struggle finding it – aan Jan 01 '20 at 14:37the incompatibility between subcaption and uorthesis still persists? I already cancel offsubcaptionin myuorthesis. – aan Jan 01 '20 at 14:40uorthesisandsubcaption. – leandriis Jan 01 '20 at 14:41uorthesisis just a list ofusepackageand does not contain anysubcaption. – aan Jan 01 '20 at 14:45uorthesiscontains\usepackage{subfigure}. Andsubfigure(loaded byuorthesis) andsubcaption(loaded in your preamble) are incompatible. – leandriis Jan 01 '20 at 14:46subfigurein theuorthesisfile. Between, now i cancel off\usepackage[demo]{graphicx}, will it create lots of problem? What isgrahicxuse for? – aan Jan 01 '20 at 14:49uorthesispackage. Instead, copy the absolutely necessary lines fromuorthesispackage to your preamble. Regarding templates and the use of such, you might want to have a look at: https://tex.stackexchange.com/a/390684/134144 – leandriis Jan 01 '20 at 14:52graphicxpackage is needed to include images into your document using the\includegraphicscommand. – leandriis Jan 01 '20 at 14:54