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I think this is (at least in part) a python bug in threading.py of python 2.7. I got the same error messages of

Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in < module 'threading' from '/usr/lib/python2.7/threading.pyc'> ignored

when I tried to launch the openni_driver or run the openni_camera/test/test_launch.py test.

There's a patch and discussion for it here.

It might not be all that's wrong (it didn't fix all my errors, anyway), but it should make those pertaining to the dummy threads go away.