dolfin: ImportError: cannot import name common

[ljofre2146@…]

Hello to all:

my problem is for import dolfin module in a habitual project. This package was installed from macport in osx yosemite

sudo port install dolfin

when I try use the dolfin module I got the next message

import dolfin as df

Traceback (most recent call last):
 File "/Users/leonardojofre/Documents/mpi4py course/ejemplos petsc/example00001.py", line7, in <module>
 import dolfin as df

 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/dolfin/__init__.py", line 16, in <module>
 from . import cpp

 File "/opt/local/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/site-packages/dolfin/cpp/__init__.py", line 42, in <module>
 exec("from . import %s" % module_name)

 File "<string>", line 1, in <module>
 ImportError: cannot import name common

it is a installation problem or is a bug?

thanks to all