Traceback (most recent call last):
  File "/usr/bin/software-center", line 113, in <module>
    app = SoftwareCenterApp(datadir, xapian_base_path, options, args)
  File "/usr/share/software-center/softwarecenter/app.py", line 169, in __init__
    self.review_loader = get_review_loader(self.cache, self.db)
  File "/usr/share/software-center/softwarecenter/db/reviews.py", line 759, in get_review_loader
    review_loader = ReviewLoaderSpawningRNRClient(cache, db)
  File "/usr/share/software-center/softwarecenter/db/reviews.py", line 352, in __init__
    self.rnrclient = RatingsAndReviewsAPI(cachedir=cachedir)
  File "/usr/lib/python2.7/dist-packages/piston_mini_client/__init__.py", line 206, in __init__
    self._httplib2_cache = httplib2.FileCache(cachedir, safe=safename)
  File "/usr/lib/python2.7/dist-packages/httplib2/__init__.py", line 649, in __init__
    os.makedirs(self.cache)
  File "/usr/lib/python2.7/os.py", line 157, in makedirs
    mkdir(name, mode)
OSError: [Errno 17] El fichero ya existe: '/home/username/.cache/software-center/rnrclient'