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Question: Error in DEtools/phaseportrait

Question:Error in DEtools/phaseportrait

ComputerUser 535 Maple 2015
detools phaseportrait
April 21 2016
0

with(DEtools):
phaseportrait([secret], [a(t), b(t), c(t)], t = -2 .. 2, [[a(0) = 1, b(0) = 0, c(0) = 2]], stepsize = 0.5e-1, scene = [c(t), a(t)], linecolour = sin((1/2)*t*Pi), method = classical[foreuler]);

Error, (in DEtools/phaseportrait) the ODE system does not contain derivatives of the unknown function a
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