Why yum fails with TypeError: 'NoneType' object is not callable ?

Solution Verified - Updated -


  • Red Hat Enterprise Linux 5
  • Red Hat Satellite
  • Red Hat Network (RHN)
  • Red Hat Subscription Management


  • yum fails with TypeError: 'NoneType' object is not callable when trying to install or update rpm packages

  • yum update, yum repolist, or yum check-update fails with following traceback:

# yum update
Loaded plugins: rhnplugin, security
Traceback (most recent call last):
  File "/usr/bin/yum", line 29, in ?
    yummain.user_main(sys.argv[1:], exit_code=True)
  File "/usr/share/yum-cli/yummain.py", line 309, in user_main
    errcode = main(args)
  File "/usr/share/yum-cli/yummain.py", line 161, in main
    return exFatal(e)
  File "/usr/share/yum-cli/yummain.py", line 64, in exFatal
    logger.critical('\n\n%s', to_unicode(e))
  File "/usr/lib64/python2.4/logging/__init__.py", line 1019, in critical
    apply(self._log, (CRITICAL, msg, args), kwargs)
  File "/usr/lib64/python2.4/logging/__init__.py", line 1078, in _log
    record = self.makeRecord(self.name, level, fn, lno, msg, args, exc_info)
  File "/usr/lib64/python2.4/logging/__init__.py", line 1064, in makeRecord
    return LogRecord(name, level, fn, lno, msg, args, exc_info)
  File "/usr/lib64/python2.4/logging/__init__.py", line 226, in __init__
    if args and (len(args) == 1) and args[0] and (type(args[0]) == types.DictType):
TypeError: 'NoneType' object is not callable
  • Tried to re-register the system by running rhn_register and it failed with error message
An error has occurred:              
Network error:                      
See /var/log/up2date for more information
  • From /var/log/update log file can see the below error message
Traceback (most recent call last):
  File "/usr/sbin/rhn_register", line 82, in ?
  File "/usr/share/rhn/up2date_client/rhncli.py", line 66, in run
    sys.exit(self.main() or 0)
  File "/usr/sbin/rhn_register", line 64, in main
  File "/usr/share/rhn/up2date_client/tui.py", line 1753, in main
  File "/usr/share/rhn/up2date_client/tui.py", line 1645, in run
    result = win.run()
  File "/usr/share/rhn/up2date_client/tui.py", line 127, in run
    tui_call_wrapper(self.screen, rhnreg.getCaps)
  File "/usr/share/rhn/up2date_client/tui.py", line 66, in tui_call_wrapper
    results = func(*params)
  File "/usr/share/rhn/up2date_client/rhnreg.py", line 295, in getCaps
  File "/usr/share/rhn/up2date_client/rhnserver.py", line 159, in __get_capabilities
  File "/usr/share/rhn/up2date_client/rhnserver.py", line 69, in __call__
    raise up2dateErrors.NetworkError(message)
up2date_client.up2dateErrors.NetworkError: Network error


  • If using RHN:
  • If using RHN Satellite:
    • If this system is registerd with Satellite then redeploy the '/usr/share/rhn/RHN-ORG-TRUSTED-SSL-CERT' file from Red Hat Network (RHN) Satellite to the client machine.
  • If using RHSM:

    • Disable RHN plugins:

    RHN Classic Plugins:

    [root@localhost ~]# vim /etc/yum/pluginconf.d/rhnplugin.conf

    enabled = 0
    gpgcheck = 1

    • Clean yum cache data:

    [root@localhost ~]# yum clean all
    Loaded plugins: refresh-packagekit, rhnplugin
    Cleaning up Everything

    • Remove (or rename) the systemid file:

    [root@localhost ~]# cd /etc/sysconfig/rhn
    [root@localhost ~]# mv systemid rhnclassic.systemid

    • Re-register system to RHSM:

    [root@localhost ~]# subscription-manager register --autosubscribe --force

Root Cause

  • This error indicate's that this system is not checking in with Red Hat Network (RHN).

Diagnostic Steps

  • Commenting out lines 226 and 227 of /usr/lib64/python2.4/logging/init.py file permitted yum to display the proper error message.
# cp  /usr/lib64/python2.4/logging/__init__.py  /usr/lib64/python2.4/logging/__init__.py.orig
- comment out line 226 and 227 in /usr/lib64/python2.4/logging/__init__.py
# if args and (len(args) == 1) and args[0] and (type(args[0]) == types.DictType):
#            args = args[0]

This solution is part of Red Hat’s fast-track publication program, providing a huge library of solutions that Red Hat engineers have created while supporting our customers. To give you the knowledge you need the instant it becomes available, these articles may be presented in a raw and unedited form.