[CentOS] Can't update

Hi,


I can't do update:

yum update
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in <module>
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 298, in user_main
    errcode = main(args)
 File "/usr/share/yum-cli/yummain.py", line 110, in main
 base = cli.YumBaseCli()
  File "/usr/share/yum-cli/cli.py", line 72, in __init__
    output.YumOutput.__init__(self)
  File "/usr/share/yum-cli/output.py", line 307, in __init__
    self.reported_error_msgs = dict((k, False) for (k, v) in
ERRORS_TO_KBASE_ARTICLES.iteritems())
NameError: global name 'ERRORS_TO_KBASE_ARTICLES' is not defined

Any suggestion ?

Thank's​