It's actually a Python bug: http://bugs.python.org/issue14308 All the best, - Gabriel From: Bhandaru, Malini K [mailto:malini.k.bhandaru at intel.com] Sent: Tuesday, December 04, 2012 3:24 AM To: OpenStack Development Mailing List Subject: [openstack-dev] horizon log error question Why does one see messages like: [Tue Dec 04 11:23:27 2012] [error] Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored Even when an UI action completes successfully? Might it be some system configuration error? Regards Malini -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-dev/attachments/20121204/d030948a/attachment.html>