Question: Example in Help doesn't work

I wanted to try this example of Maple's help, but it gives an error message:



f := y^2-x*(x^2-1);

plot_real_curve(f, x, y, showArrows = true);

Error, (in algcurves/CurvePlot:-PlotRealCurve) too many levels of recursion

This example is the first on the page of plot_real_curve. ?plot_real_curve

I have Maple 12.02,  Windows Xp, Standard Worsksheet.

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