Cover letter session title disappeared

[Flancis]

Thanking you for developing this cv template. It is really useful for academic usage.

However, it seems that the session title for the cover letter disappeared. I tried copying the following codes from the original awesome-cv,cls document to replace the corresponding lines in this template, but the session title color disappeared though the session title appeared. The codes from the original document are as follows:
\newcommand{\cvparagraph}[1]{ \par\addvspace{2.5ex} \phantomsection{} \paragraphstyle{#1} \color{gray}\vhrulefill{0.9pt} \par\nobreak\addvspace{0.4ex} }

[Flancis]

It seems that with this template, I need to use \lettersection instead of \cvparagraph. However, using the command '\lettersection' gives the following errors:
Undefined control sequence. \lettersection{About Me}.