I was able to get rid of this error by installing python-cups-1.9.55. See also: http://git.fedorahosted.org/git/?p=pycups.git;a=commit;h=34d07f5d6489af1f5895ee210dc8ec130583903a https://admin.fedoraproject.org/updates/python-cups-1.9.55-1.fc15
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