[webkit-dev] new-run-webkit-tests --gtk fails with "AttributeError: GtkDriver instance has no attribute '_server_process'"

[Vanya Yani]

I'm trying to run NRWT for gtk build revision 99472.

But script fails with exceptions:

AttributeError: GtkDriver instance has no attribute '_server_process'
worker/0 raised OSError('[Errno 2] No such file or directory'):

Traceback is available here: http://pastebin.com/B5pE8AJg

Is there a bug in script or I'm doing something wrong?
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