documentclass{article}
usepackage{sa-tikz}

begin{document}

begin{tikzpicture}
node[N=8,r1=4,M=8,r3=4,clos rear={module label opacity=0}] {};
draw[red,ultra thick](r1-2-input-1)–(r1-2-output-2)
(r2-2-input-2)–(r2-2-output-3)
(r3-3-input-2)–(r3-3-output-2);
draw[red,ultra thick](r1-4-input-1)–(r1-4-output-1)
(r2-1-input-4)–(r2-1-output-1)
(r3-1-input-1)–(r3-1-output-2);
end{tikzpicture}

end{document}

Package tikz Error: Giving up on this path. Did you forget a semicolon?.