[Python] inverse laplace transform in Sympy

I am stuck with the inverse laplace using sympy for the function

(21.4375*s**2 - 128.5*s + 1.0)/(-187.03125*s**3 - 297.9375*s**2 - 126.0*s + 1.0)


it shows RisingFactorial(_t + 1, 1.0) contains an element of the set of generators.

I was using sympy

Aprox_t = inverse_laplace_transform(PD_s, s, t)
pprint(Aprox_t)

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