Note: already posted a working fix for the recipe at 
https://groups.google.com/d/msg/web2py-usuarios/5borwCNAXQc/-F_GsFWGeeUJ

You appear to be calling the action with .xml but the data returned by the 
> action is not serializable in xml.
>

In nabvar.py, response.menu is set to a generator, but the MENU helper 
docstring specifies a list of lists as input.

Did MENU accept a generator in previous versions? If so, there is a 
backwards compatibility issue. Otherwise there is a bug in the recipe.

-- 
Resources:
- http://web2py.com
- http://web2py.com/book (Documentation)
- http://github.com/web2py/web2py (Source code)
- https://code.google.com/p/web2py/issues/list (Report Issues)
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