luci reports traceback and error in logs: "TypError: No object (name: translator) has been registered for this thread" in RHEL 6

Issue

• luci reports 'TypeError: No object (name: translator) has been registered for this thread'

18:11:17,897 ERROR [luci.lib.ricci_communicator] Error receiving header from node2:11111
Traceback (most recent call last):
  File "/usr/lib64/python2.6/site-packages/luci/lib/ricci_communicator.py", line 121, in __init__
    hello = self.__receive(self.__timeout_init)
  File "/usr/lib64/python2.6/site-packages/luci/lib/ricci_communicator.py", line 503, in __receive
    errstr = _('Error reading from %s:%d: %s') \
  File "/usr/lib/python2.6/site-packages/pylons/i18n/translation.py", line 106, in ugettext
    return pylons.translator.ugettext(value)
  File "/usr/lib/python2.6/site-packages/paste/registry.py", line 137, in __getattr__
    return getattr(self._current_obj(), attr)
  File "/usr/lib/python2.6/site-packages/paste/registry.py", line 197, in _current_obj
    'thread' % self.____name__)
TypeError: No object (name: translator) has been registered for this thread