I'm using a LaTeX template for a research article
I've converted the .tex file to a minimal example:
\documentclass[fleqn,10pt]{SelfArx}
\begin{document}
\subsection*{Results}
\end{document}
The file SelfArx.cls can be downloaded here
When I compile the LaTeX code above, I get these errors:
How can I resolve this problem?

pacman -S texlive-latexextrato get the packagelastpage.sty. – Matthias Braun May 11 '22 at 19:44