I cant submit reviews to USC for any applications. First it gave me an "unknown error", and then it says I can't submit multiple reviews, while in fact the first one has failed. I am logged into Software Center, and this happened for four different apps.

Here is the log:

submit_review
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/review_gui_helper.py", line 327, in _submit_reviews_if_pending
    res = self.rnrclient.submit_review(review=piston_review)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/validators.py", line 65, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 120, in wrapper
    body = func(self, *args, **kwargs)
  File "/usr/share/software-center/softwarecenter/backend/piston/rnrclient_pristine.py", line 133, in submit_review
    scheme=AUTHENTICATED_API_SCHEME, content_type='application/json')
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 398, in _post
    headers=headers, scheme=scheme)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 539, in _request
    body = handler.handle(response, response_body)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/failhandlers.py", line 116, in handle
    data=self.data)
APIError: 400: {'status': '400', 'content-length': '78', 'via': '1.1 reviews.ubuntu.com', 'vary': 'Authorization,Accept-Encoding', 'server': 'Apache/2.2.14 (Ubuntu)', 'connection': 'close', '-content-encoding': 'gzip', 'date': 'Fri, 23 Nov 2012 22:18:44 GMT', 'content-type': 'text/html; charset=utf-8'}
{"errors": {"__all__": ["A user cannot create multiple reviews for an app."]}}
root@alexykot-D620:/home/alexykot/.cache/software-center# cat ./reviews-helper.log 
submit_review
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/review_gui_helper.py", line 327, in _submit_reviews_if_pending
    res = self.rnrclient.submit_review(review=piston_review)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/validators.py", line 65, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 120, in wrapper
    body = func(self, *args, **kwargs)
  File "/usr/share/software-center/softwarecenter/backend/piston/rnrclient_pristine.py", line 133, in submit_review
    scheme=AUTHENTICATED_API_SCHEME, content_type='application/json')
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 398, in _post
    headers=headers, scheme=scheme)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 539, in _request
    body = handler.handle(response, response_body)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/failhandlers.py", line 116, in handle
    data=self.data)
APIError: 400: {'status': '400', 'content-length': '78', 'via': '1.1 reviews.ubuntu.com', 'vary': 'Authorization,Accept-Encoding', 'server': 'Apache/2.2.14 (Ubuntu)', 'connection': 'close', '-content-encoding': 'gzip', 'date': 'Fri, 23 Nov 2012 22:18:44 GMT', 'content-type': 'text/html; charset=utf-8'}
{"errors": {"__all__": ["A user cannot create multiple reviews for an app."]}}
GwibberHelper.accounts() failed
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/gwibber_helper.py", line 45, in accounts
    "/com/gwibber/Accounts")
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 241, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/python2.7/dist-packages/dbus/proxies.py", line 248, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 180, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python2.7/dist-packages/dbus/bus.py", line 278, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python2.7/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
DBusException: org.freedesktop.DBus.Error.ServiceUnknown: The name com.Gwibber.Accounts was not provided by any .service files
submit_review
Traceback (most recent call last):
  File "/usr/share/software-center/softwarecenter/ui/gtk3/review_gui_helper.py", line 327, in _submit_reviews_if_pending
    res = self.rnrclient.submit_review(review=piston_review)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/validators.py", line 65, in wrapper
    return func(*args, **kwargs)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 120, in wrapper
    body = func(self, *args, **kwargs)
  File "/usr/share/software-center/softwarecenter/backend/piston/rnrclient_pristine.py", line 133, in submit_review
    scheme=AUTHENTICATED_API_SCHEME, content_type='application/json')
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 398, in _post
    headers=headers, scheme=scheme)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 535, in _request
    e.message))
SocketError: connecting to http://reviews.ubuntu.com/reviews/api/1.0: 
connecting to http://reviews.ubuntu.com/reviews/api/1.0: