^CTraceback (most recent call last):
  File "/usr/bin/ceph", line 948, in <module>
    retval = main()
  File "/usr/bin/ceph", line 881, in main
    sigdict, inbuf, verbose)
  File "/usr/bin/ceph", line 479, in new_style_command
    inbuf=inbuf)
  File "/usr/lib/python2.7/site-packages/ceph_argparse.py", line 1291, in json_command
    raise RuntimeError('"{0}": exception {1}'.format(argdict, e))
RuntimeError: "{u'var': u'crush_ruleset', 'prefix': u'osd pool set', u'val': u'2', u'pool': u'lxc'}": exception "['{"var": "crush_ruleset", "prefix": "osd pool set", "pool": "lxc", "val": "2"}