[pstricks] auto-pst-pdf fails to produce the output

[Donut E. Knot]

Dear folks,

I noticed the following code just produces 2 blank pages when compiled with pdflatex (with shell-escape enabled).
What is wrong?

\documentclass{article}
\usepackage{auto-pst-pdf}
\usepackage{pst-node}
\psset{colsep=1cm,rowsep=2cm,mnode=C,fillstyle=solid,fillcolor=blue,linecolor=blue!40}
\begin{document}
\begin{psmatrix}
&[]&&[]&&[]\\ []&&[]&[]&&[]
\end{psmatrix}
\psset{linecolor=.}\ncline{1,2}{2,1}\ncline{1,2}{2,3}\ncline{2,1}{2,3}\ncline{1,4}{1,6}\ncline{2,4}{2,6}\ncline{1,4}{2,4}\ncline{1,6}{2,6}
\end{document}


Thank you in advance.

Best regards,

Code Mocker
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