def errback(self, reason=None):
        for subscr in self._itersubscriptions():
            subscr.errback(reason)
:param Conference conference:
dataset/ETHPy150Open ClusterHQ/flocker/flocker/restapi/testtools.py/EventChannel.errback--crossover with--dataset/ETHPy150Open CenterForOpenScience/osf.io/website/conferences/utils.py/provision_node