-\def\newlanguage  {\e@alloc\language \chardef{\count19}\m@ne\@cclvi}
 \let\newfam\new@mathgroup
+%    \end{macrocode}
+%
+% \changes{v2.3a}{2016/10/16}{Allow languages up to 16383 in luatex}
+%    \begin{macrocode}
+\ifx\directlua\@undefined
+  \def\newlanguage  {\e@alloc\language \chardef{\count19}\m@ne\@cclvi}
+\else
+  \def\newlanguage  {\e@alloc\language \chardef{\count19}\m@ne{16384}}
+\fi

PANIC: unprotected error in call to Lua API ((null))
Aborted (core dumped)

Dear Tom,

I have made some observation while using your document class.

I noticed that I had some accented letters in the references of my document and so I need the \RequirePackage[utf8]{inputenc}, which I included for seamless typesetting.

I have included the following packages in your document class for improved typeseting of scientific articles:
\RequirePackage[version=4]{mhchem} for chemical symbols and equation
\RequirePackage{siunitx} for SI units
\RequirePackge{multirow} for float environment.

\fancypagestyle{plain}{%
\fancyhf{} % clear all header and footer fields
\fancyfoot[C]{\textbf{\thepage}} % except the center
\renewcommand{\headrulewidth}{0pt}
\renewcommand{\footrulewidth}{0pt}}

\documentclass[a4paper,oneside,11pt]{report}

\usepackage{fancyhdr}
\usepackage{lipsum}

\fancypagestyle{plain}{%
  \fancyhf{}% clear all header and footer fields
  \fancyfoot[C]{---\thepage---}% except the center
  \renewcommand{\headrulewidth}{0pt}%
  \renewcommand{\footrulewidth}{0pt}%
}
\pagestyle{plain}

\begin{document}
\pagenumbering{gobble}
\lipsum[0]
\clearpage
\pagenumbering{Roman}
\addcontentsline{toc}{section}{Abstract}
\lipsum[1]
\clearpage
\addcontentsline{toc}{section}{Acknowledgement}