Multirow undefined control sequence – Math Solves Everything

I am having some problems using multirow. I'm not sure if it's due to the qcr font as I'm just learning LaTeX. Could someone help me identify the problem? I have created a simple document to reproduce the problem:

\documentclass[preprint]{elsarticle}
\usepackage{hyperref}
\usepackage[utf8]{inputenc}
\usepackage{hyperref}
\usepackage[english]{babel}
\usepackage{amsfonts}
\usepackage{amsmath}
\usepackage{mathtools}
\usepackage{amssymb}
\usepackage{epsfig}
\usepackage{alltt}
\usepackage{fixme}
\usepackage[table,xcdraw]{xcolor}
\usepackage{pstricks}
\usepackage{pst-node}
\usepackage{enumerate}
\usepackage[T1]{fontenc}
\usepackage{xr}
\usepackage{graphics}
\usepackage{listings}
\usepackage{tcolorbox}
\usepackage{blindtext}
\usepackage{xcolor}
\usepackage[ruled, lined, linesnumbered, commentsnumbered, longend]{algorithm2e}
\usepackage{algpseudocode}
\usepackage{booktabs}
\usepackage{verbatim}
\journal{Journal of Computational Science}
\bibliographystyle{elsarticle-num}
\begin{document}
\begin{frontmatter} 

% ----- Title -----
\title{Blah, blah, blah\tnoteref{t1}}

% ---------- Abstract ----------
\begin{abstract}
Blah, blah, blah
\end{abstract}
\end{frontmatter}

% ---------- Table ----------
\begin{table}[]
\scriptsize
\begin{center}
\caption{The most commonly used variables for PRNG}
\begin{tabular}{|c|l|p{4.7cm}|}
\hline
\rowcolor[HTML]{EFEFEF} 
{\color[HTML]{000000} \textbf{Based on}} & \multicolumn{1}{c|}{\cellcolor[HTML]{EFEFEF}{\color[HTML]{000000} \textbf{Name}}} & \multicolumn{1}{c|}{\cellcolor[HTML]{EFEFEF}{\color[HTML]{000000} \textbf{Description}}} \\ \hline
                                 & {\fontfamily{qcr}\selectfont block.coinbase}                     & Address of the miner who mined the current block\\ \cline{2-3} 
                                 & {\fontfamily{qcr}\selectfont block.difficulty}                   & Relative measure of how difficult it was to find the block\\ \cline{2-3} 
                                 & {\fontfamily{qcr}\selectfont block.gaslimit}                     & Maximum gas consumption for transactions within the block\\ \cline{2-3} 
\multirow{-5}{*}{Block variable} & {\fontfamily{qcr}\selectfont block.number}                       & Height of current block\\ \cline{2-3} 
                                 & {\fontfamily{qcr}\selectfont block.timestamp}                    & When the block was mined\\ \hline
                                 & {\fontfamily{qcr}\selectfont block.blockhash(block.number)}      & Blockhash of the current block\\ \cline{2-3} 
                                 & {\fontfamily{qcr}\selectfont block.blockhash(block.number - 1)}  & Blockhash of the last block\\ \cline{2-3} 
\multirow{-3}{*}{Blockhash}      & {\fontfamily{qcr}\selectfont block.blockhash()}                  & Blockhash of a block that is at least 256 blocks older than the current one\\ \hline
\end{tabular}
\end{center}
\end{table}

\bibliography{references}
\end{document}

\documentclass[preprint]{elsarticle} \usepackage[T1]{fontenc} \usepackage[xcdraw]{xcolor} \usepackage{tabularray} \begin{document} % ---------- Table ---------- \begin{table}[htb] \small \caption{The most commonly used variables for PRNG} \begin{tblr}{hline{1,2,Z} = 0.8pt, hline{3-Y} = 0.2pt, vlines, colspec = {Q[c,m, 3.4em] Q[l,m, font=\fontfamily{qcr}] X[l,m]}, colsep = 4pt, row{1} = {font=\bfseries, bg=gray!30} } Based on & Name & Description \\ \SetCell[r=5]{c} Block variable & block.coinbase & Address of the miner who mined the current block \\ & block.difficulty & Relative measure of how difficult it was to find the block \\ & block.gaslimit & Maximum gas consumption for transactions within the block \\ & block.number & Height of current block \\ & block.timestamp & When the block was mined \\ % \SetCell[r=3]{c} Block\-hash & block.blockhash(block.number) & Blockhash of the current block \\ & block.blockhash(block.number\,-\,1) & Blockhash of the last block \\ & block.blockhash() & Blockhash of a block that is at least 256 blocks older than the current one \\ \end{tblr} \end{table} \end{document}

\documentclass[preprint]{elsarticle} \usepackage[T1]{fontenc} \usepackage[table, xcdraw]{xcolor} \usepackage{ragged2e} % new \usepackage{booktabs, makecell, multirow, tabularx} % new \renewcommand\theadfont{\bfseries} \begin{document} % ---------- Table ---------- \begin{table}[htb] \caption{The most commonly used variables for PRNG} \small \renewcommand\tabularxcolumn[1]{m{#1}} \renewcommand\arraystretch{1.1} \begin{tabularx}{\linewidth}{|>{\centering}p{3.4em} |>{\fontfamily{qcr}\selectfont}l |>{\RaggedRight}X|} \Xhline{0.8pt} \thead{Based\\ on} & \thead{Name} & \thead{Description} \\ \Xhline{0.8pt} \multirow{10}{=}{Block variable} & block.coinbase & Address of the miner who mined the current block \\ \cline{2-3} & block.difficulty & Relative measure of how difficult it was to find the block \\ \cline{2-3} & block.gaslimit & Maximum gas consumption for transactions within the block \\ \cline{2-3} & block.number & Height of current block \\ \cline{2-3} & block.timestamp & When the block was mined \\ \hline % \multirow{6}{=}{Block\-hash} & block.blockhash(block.number) & Blockhash of the current block \\ \cline{2-3} & block.blockhash(block.number\,-\,1) & Blockhash of the last block \\ \cline{2-3} & block.blockhash() & Blockhash of a block that is at least 256 blocks older than the current one \\ \Xhline{0.8pt} \end{tabularx} \end{table} \end{document}

Best Answer

you need to clean-up your preamble (remove all twice loaded packages, move hyperref on the end preamble)
your table can be significantly simplified:
- by use of (relative new package) tabularray

by use makecell, multirow and tabularx package:

(red lines indicate text area border)

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