Get an error when executing notebook() [sage 9.0 on OS X 10.11.6] [closed]

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Hi,

I've just intalled SageMath 9.0 in Mac OS X El Capitan and when I execute sage and call notebook() or inotebook() I get the followign error:

ImportError: cannot import name 'smtp' from 'twisted.mail' (unknown location)

so I can't use sage from a notebook in the navigator.

Thanks,