Unable to install: no module pbr.pbr_json

Hi,
I'm trying to install the wiki and I'm getting this error after running pip install realms-wiki:
Installed /tmp/easy_install-OsO0yD/traceback2-1.4.0/pbr-1.2.0-py2.6.egg

Installed /tmp/pip-build-root/unittest2/traceback2-1.4.0-py2.6.egg

Searching for six>=1.4

Reading http://pypi.python.org/simple/six/

Best match: six 1.9.0

Downloading https://pypi.python.org/packages/source/s/six/six-1.9.0.tar.gz#md5=476881ef4012262dfc8adc645ee786c4

Processing six-1.9.0.tar.gz

Running six-1.9.0/setup.py -q bdist_egg --dist-dir /tmp/easy_install-Ubg0Jy/six-1.9.0/egg-dist-tmp-kANAIq

Traceback (most recent call last):

  File "<string>", line 16, in <module>

  File "/tmp/pip-build-root/unittest2/setup.py", line 87, in <module>

    setup(**params)

  File "/usr/lib64/python2.6/distutils/core.py", line 113, in setup

    _setup_distribution = dist = klass(attrs)

  File "/usr/lib/python2.6/site-packages/setuptools/dist.py", line 221, in __init__

    self.fetch_build_eggs(attrs.pop('setup_requires'))

  File "/usr/lib/python2.6/site-packages/setuptools/dist.py", line 245, in fetch_build_eggs

    parse_requirements(requires), installer=self.fetch_build_egg

  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 538, in resolve

    dist = best[req.key] = env.best_match(req, self, installer)

  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 780, in best_match

    return self.obtain(req, installer) # try and download/install

  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 792, in obtain

    return installer(requirement)

  File "/usr/lib/python2.6/site-packages/setuptools/dist.py", line 293, in fetch_build_egg

    return cmd.easy_install(req)

  File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 472, in easy_install

    return self.install_item(spec, dist.location, tmpdir, deps)

  File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 502, in install_item

    dists = self.install_eggs(spec, download, tmpdir)

  File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 681, in install_eggs

    return self.build_and_install(setup_script, setup_base)

  File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 958, in build_and_install

    self.run_setup(setup_script, setup_base, args)

  File "/usr/lib/python2.6/site-packages/setuptools/command/easy_install.py", line 947, in run_setup

    run_setup(setup_script, args)

  File "/usr/lib/python2.6/site-packages/setuptools/sandbox.py", line 29, in run_setup

    lambda: execfile(

  File "/usr/lib/python2.6/site-packages/setuptools/sandbox.py", line 70, in run

    return func()

  File "/usr/lib/python2.6/site-packages/setuptools/sandbox.py", line 31, in <lambda>

    {'__file__':setup_script, '__name__':'__main__'}

  File "setup.py", line 31, in <module>

  File "/usr/lib64/python2.6/distutils/core.py", line 152, in setup

    dist.run_commands()

  File "/usr/lib64/python2.6/distutils/dist.py", line 975, in run_commands

    self.run_command(cmd)

  File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command

    cmd_obj.run()

  File "/usr/lib/python2.6/site-packages/setuptools/command/bdist_egg.py", line 167, in run

    self.run_command("egg_info")

  File "/usr/lib64/python2.6/distutils/cmd.py", line 333, in run_command

    self.distribution.run_command(command)

  File "/usr/lib64/python2.6/distutils/dist.py", line 995, in run_command

    cmd_obj.run()

  File "<string>", line 11, in replacement_run

  File "/usr/lib/python2.6/site-packages/pkg_resources.py", line 1948, in load

    entry = __import__(self.module_name, globals(),globals(), ['__name__'])

ImportError: No module named pbr.pbr_json

----------------------------------------
Command python setup.py egg_info failed with error code 1 in /tmp/pip-build-root/unittest2
Storing complete log in /root/.pip/pip.log
Here the full log.
How can I solve this issue?
scragg0x / realms-wiki

Unable to install: no module pbr.pbr_json #56
