I can't access preferences>output options (generates error and fails)

[Kazar]

here inclosed the full error report:

calibre, version 2.20.0
ERREUR : Exception non gérée: <b>ImportError</b>:No module named PyQt4

calibre 2.20 isfrozen: True is64bit: False
Windows-7-6.1.7601-SP1 Windows ('32bit', 'WindowsPE')
32bit process running on 64bit windows
('Windows', '7', '6.1.7601')
Python 2.7.9
Windows: ('7', '6.1.7601', 'SP1', 'Multiprocessor Free')
Successfully initialized third party plugins: Fichier de sortie KePub && KindleUnpack - The Plugin && KoboTouchExtended && Kobo Utilities && Wiki Reader
Traceback (most recent call last):
  File "site-packages\calibre\gui2\preferences\main.py", line 293, in show_plugin
  File "site-packages\calibre\gui2\preferences\conversion.py", line 57, in genesis
  File "site-packages\calibre\gui2\preferences\conversion.py", line 54, in widget_factory
  File "calibre_plugins.koboconversion.conversion.config", line 32, in __init__
  File "site-packages\calibre\gui2\convert\__init__.py", line 62, in __init__
  File "calibre_plugins.koboconversion.conversion.config", line 41, in setupUi
ImportError: No module named PyQt4

[Kovid Goyal (kovid)]

Uninstall or update the third party kobo plugins you have installed.

 status invalid