systeme space error

Question

I am trying to reduce spaces with in my system of equation with systeme package. I followed the instruction in the documentation, but it gives me errors.

Undefined control sequence. \syssignspace

Here is the code I am using.

\documentclass{article}
\usepackage{systeme}

\begin{document}

\begin{equation}    
\syssignspace{3pt}\syseqspace{10pt}
\systeme{
    x_1 +x_2 -x_3 -2 x_4 -3 x_5= 0{,},
    -3 x_2 +4 x_3 +16 x_4 +25 x_5=0}
\systeme{
    x_1 = -x_2 +x_3 +2 x_4 +3 x_5{,},
    x_2 = +4 x_3 +16 x_4 +25 x_5
}
\end{equation}

\end{document}