pst-gantt outputting incorrectly
===

Trying to use pst-gantt right now, and although I'm following the documentation as closely as I can (the specific documentation of pst-gantt seems to be a bit vague), and have tried again and again to output something meaningful. Mostly have been getting strange output where lots of text is overlapping each other, or in this case, almost nothing:

    \documentclass{article}
    \usepackage{pst-gantt}
    
    \begin{document}
    \begin{figure}
        \newpsstyle{Primary}{fillstyle=solid,fillcolor=red}
        \newpsstyle{NotImportant}{fillstyle=vlines}
        \begin{PstGanttChart}{5}{7}
            \PstGanttTask{0}{3}
            \PstGanttTask{2}{1}
            \PstGanttTask[TaskStyle=Primary, TaskInsideLabel=Primary]{2}{5}
            \PstGanttTask[TaskStyle=NotImportant]{4}{2}
            \PstGanttTask{5}{2}
        \end{PstGanttChart}
    \end{figure}
    \end{document}

This is basically copied from the documentation (apart from everything from the `\begin{figure}` up and the `\end{figure}` down), and yet only outputs the single word 'Primary' in the middle of the page, and the page number '1' at the bottom of the page. That's it. It is being turned into a dvi with the `latex` command.

Any ideas?