Hi all!

I am trying to do simple convolution:

x = PolynomialRing(QQ,'x').gen()

f=piecewise([((-1,3),1*x^0)])
g=piecewise([((0,5),exp(-x))])
r=g.convolution(f)

and got this error message:
RuntimeError: Symbolic Ring still using old coercion framework

What is wrong with it?
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