Couldn't load SIP module.

[Xristos Xristoou]

hello
i using python 2.7.12 on ubuntu 16.04 and i have that error with SIP :

Couldn't load SIP module.


Traceback (most recent call last):
  File "", line 1, in 
ImportError: /usr/local/lib/python2.7/site-packages/sip.so: undefined symbol: PyUnicodeUCS2_AsUTF8String

('Qt version:', '4.8.7')
('SIP version:', '4.17')
('PyQt version:', '4.11.4')

any idea how to fix that ?