Hello, 
When I try to use a Vielbein in cadabra2 I get the following error:
h^{m}_{\mu}::Vielbein.
The error reads:
Traceback (most recent call last):
   File "<string>", line 11, in <module>
NameError: name 'Vielbein' is not defined
Does anybody have experience with this?
Thank you, 
Asier