can't run test.unit.proxy.controller.test_container module on it's own using nose

test.err

vagrant@saio:~$ nosetests swift/test/unit/proxy/controllers/test_container.py
Traceback (most recent call last):
  File "/usr/local/bin/nosetests", line 8, in <module>
    sys.exit(run_exit())
  File "/usr/local/lib/python2.7/dist-packages/nose/core.py", line 121, in __init__
    **extra_args)
  File "/usr/lib/python2.7/unittest/main.py", line 95, in __init__
    self.runTests()
  File "/usr/local/lib/python2.7/dist-packages/nose/core.py", line 207, in runTests
    result = self.testRunner.run(self.test)
  File "/usr/local/lib/python2.7/dist-packages/nose/core.py", line 62, in run
    test(result)
  File "/usr/local/lib/python2.7/dist-packages/nose/suite.py", line 177, in __call__
    return self.run(*arg, **kw)
  File "/usr/local/lib/python2.7/dist-packages/nose/suite.py", line 224, in run
    test(orig)
  File "/usr/local/lib/python2.7/dist-packages/nose/suite.py", line 177, in __call__
    return self.run(*arg, **kw)
  File "/usr/local/lib/python2.7/dist-packages/nose/suite.py", line 224, in run
    test(orig)
  File "/usr/local/lib/python2.7/dist-packages/nose/suite.py", line 177, in __call__
    return self.run(*arg, **kw)
  File "/usr/local/lib/python2.7/dist-packages/nose/suite.py", line 224, in run
    test(orig)
  File "/usr/local/lib/python2.7/dist-packages/nose/case.py", line 45, in __call__
    return self.run(*arg, **kwarg)
  File "/usr/local/lib/python2.7/dist-packages/nose/case.py", line 138, in run
    result.addError(self, err)
  File "/usr/local/lib/python2.7/dist-packages/nose/proxy.py", line 128, in addError
    formatted = plugins.formatError(self.test, err)
  File "/usr/local/lib/python2.7/dist-packages/nose/plugins/manager.py", line 99, in __call__
    return self.call(*arg, **kw)
  File "/usr/local/lib/python2.7/dist-packages/nose/plugins/manager.py", line 141, in chain
    result = meth(*arg, **kw)
  File "/usr/local/lib/python2.7/dist-packages/nose/plugins/capture.py", line 74, in formatError
    test.capturedOutput = output = self.buffer
  File "/usr/local/lib/python2.7/dist-packages/nose/plugins/capture.py", line 112, in _get_buffer
    return self._buf.getvalue()
  File "/usr/lib/python2.7/StringIO.py", line 271, in getvalue
    self.buf += ''.join(self.buflist)
UnicodeDecodeError: 'ascii' codec can't decode byte 0xe2 in position 157: ordinal not in range(128)