Problem with \cdashline and package arydshln

Problem with \cdashline and package arydshln

I have a problem with \cdashline. I use the \cdashline in a matrix but I
have an error with \usepackage{arydshln} I think:
! Use of \x doesn't match its definition.
\LT@array ->\adl@arrayinit
\adl@LTfirstpagetrue \let \adl@discard \relax
\le...
l.5034 }{}
If I remove \usepackage{arydshln} latex will not stack but it will not
recognize \cdashline. The strange thing is that package and \cdashline
works at my pc at home (Windows environment and Miktex tool) but is not
working from ubuntu in work.
MWE:
\documentclass[oneside]{memoir}
\usepackage{multirow}
\usepackage{array}
\usepackage{tabularx}
\usepackage{longtable}
\usepackage{pdflscape}
\usepackage{pifont}
\usepackage{arydshln}
\begin{document}
\begin{longtable}{llp{6.5cm}}
\textbf{System} & \textbf{Class} & \textbf{Tokens included in class} \\
~ & ~ & \\
\cdashline{2-3}
\end{longtable}
\end{document}