required built-in appearance SystemAppearance not found

I'm getting hard app crash in calling the native module. Anyone seen this before?

``` sh
$ py.test -f .
============================= test session starts ==============================
platform darwin -- Python 2.7.9 -- py-1.4.30 -- pytest-2.7.2
rootdir: [redacted], inifile:
plugins: cov, osxnotify, xdist, xdist, xdist
Traceback (most recent call last):
File "/usr/local/bin/py.test", line 11, in
sys.exit(main())
File "/usr/local/lib/python2.7/site-packages/_pytest/config.py", line 41, in main
return config.hook.pytest_cmdline_main(config=config)
File "/usr/local/lib/python2.7/site-packages/_pytest/core.py", line 521, in __call__
return self._docall(self.methods, kwargs)
File "/usr/local/lib/python2.7/site-packages/_pytest/core.py", line 528, in _docall
firstresult=self.firstresult).execute()
File "/usr/local/lib/python2.7/site-packages/_pytest/core.py", line 394, in execute
res = method(*args)
File "/usr/local/lib/python2.7/site-packages/xdist/looponfail.py", line 24, in pytest_cmdline_main
looponfail_main(config)
File "/usr/local/lib/python2.7/site-packages/xdist/looponfail.py", line 35, in looponfail_main
remotecontrol.loop_once()
File "/usr/local/lib/python2.7/site-packages/xdist/looponfail.py", line 102, in loop_once
result = self.runsession()
File "/usr/local/lib/python2.7/site-packages/xdist/looponfail.py", line 91, in runsession
return self.channel.receive()
File "/usr/local/lib/python2.7/site-packages/execnet/gateway_base.py", line 737, in receive
raise self._getremoteerror() or EOFError()
EOFError: couldnt load message header, expected 9 bytes, got 0
```

```
Application Specific Information:
*** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Critical error: required built-in appearance SystemAppearance not found'
abort() called
terminating with uncaught exception of type NSException
```