[PyKDE] eric3 installation problem

[alex rait]

Once I was able to run eric smoothly but now I get some strange error:
bash-3.00$ python eric3.py
Traceback (most recent call last):
  File "eric3.py", line 23, in ?
    from Utilities import Startup
  File "/home/alexrait/programs/eric-3.7.0/eric/Utilities/Startup.py", line 18, in ?
    import Preferences
  File "/home/alexrait/programs/eric-3.7.0/eric/Preferences/__init__.py", line 24, in ?
    from qtext import QextScintilla
ImportError: cannot import name QextScintilla
bash-3.00$ 

So I tried to run the import manually in python
from qext import * 
and I get this:
>>> import qtext
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
RuntimeError: the sip module supports API v%u.0 to v%u.%u but the %s module requires API v%u.%u

I don't know what's wrong here.... any help?