[dune-fem] GeometryGrid and TwistUtility

[Agnese, Marco]

Hi Duners,
in my code I have a GeometryGrid defined over an Alugrid and a lower dimension GeometryGrid over an Albertagrid. This works fine.

Instead, if I use for both GeometryGrid-s an Alberta grid, it doesn't compile:  the error says that TwistUtility cannot be overloaded (see attachment). 
What is the problem?

Thank you very much,
cheers,
Marco. 
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