Compound PML issue

General
1

I want to define a cylindrical PML. I followed pmltest3d.py from py-tutorial and tried to use pml.Compound as follows:

pml_cylinder=pml.Compound(pml.Radial(origin=(0.3,0.3),rad=0.2),pml.Cartesian(0.1,0.9))

but got this error message

pml_cylinder=pml.Compound(pml.Radial(origin=(0.3,0.3),rad=0.2),pml.Cartesian(0.1,0.9))
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

TypeError: ‘ngsolve.ngstd.DummyArgument’ object is not iterable

How can I define a cylindrical PML?

Thanks