Question: DynamicalSystems ResponsePlot problem

Hello,

I would like to use the ResponsePlot function from the DynamicalSystems package, but it doesn't work for me (it gives an error message see below):

restart;with(DynamicSystems);
tr:=1/(1+1.000000000*s/Pi);
sys1 := NewSystem(TransferFunction(tr));
PrintSystem(sys1);
MagnitudePlot(sys1);
vin := Sine(1, 2);
Tsim := 10;
ResponsePlot(sys1,vin,duration=Tsim,color=[red, blue],thickness=2);
 

Error, (in dsolve/numeric/type_check) invalid input: member received pts, which is not valid for its 2nd argument, s
 

Interestingly, the original example on the help page of ResponsePlot also doesn't work, it gives the same error message.  ?ResponsePlot

I have Maple 13.

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