ImportError cannot import name _common(Python 3.4) -

i using python 3.4 , installed psutil. when import module using

import psutil 

in shell following error:

traceback (most recent call last): file "<pyshell#3>", line 1, in <module>     import psutil   file "f:\python34\lib\site-packages\psutil\__init__.py", line 28, in <module>     . import _common importerror: cannot import name '_common' 

i have found multiple post kind of error, error library made themself i'm wondering how fix downloaded , didn't change myself.