Probelm with roscore [closed]

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Hy all!!

every time I try to start a roscrore I get this message:

setting /run_id to 52b9b424-63e2-11e2-bcc3-14dae9614b4d
Exception AttributeError: AttributeError("'_DummyThread' object has no attribute '_Thread__block'",) in <module 'threading'="" from="" '="" usr="" lib="" python2.7="" threading.pyc'=""> ignored
process[rosout-1]: started with pid [21681]

However it starts the core.....

I would like to solve that issue so I don't get this message any more.

Thanks