error during upgrade from Ubuntu 14.04 to 14.10

[Guybrush88]

when i was upgrading Ubuntu from 14.04 to 14.10, i got this error in a terminal:

Traceback (most recent call last):
  File "/usr/sbin/update-software-center", line 176, in <module>
    pathname, appinfo_dir=options.app_install_desktop_dir)
  File "/usr/share/software-center/softwarecenter/db/update.py", line 1147, in rebuild_database
    cache = get_pkg_info()
  File "/usr/share/software-center/softwarecenter/db/pkginfo.py", line 245, in get_pkg_info
    from softwarecenter.db.pkginfo_impl.aptcache import AptCache
  File "/usr/share/software-center/softwarecenter/db/pkginfo_impl/aptcache.py", line 30, in <module>
    from aptdaemon.client import AptClient
  File "/usr/lib/python2.7/dist-packages/aptdaemon/client.py", line 43, in <module>
    _GObject = GObject.GObject
  File "/usr/lib/python2.7/dist-packages/gi/__init__.py", line 62, in __getattr__
    raise AttributeError(_static_binding_error)
AttributeError: When using gi.repository you must not import static modules like "gobject". Please change all occurrences of "import gobject" to "from gi.repository import GObject".