Comment 2 for bug 1393809

On first attempt slave-01_controller was offline, or atleast it was considered offline by nailgun database, that is why this error occured.

from nailgun/app.log

2014-11-18 01:15:48.669 WARNING [7f93d1652740] (manager) Checking prerequisites failed: Nodes "slave-01_controller (id=1, mac=64:a6:70:79:87:68)" are offline. Remove them from environment and try again.

from nailgun/assasind.log

2014-11-18 01:15:21.540 INFO [7ff0f23b0700] (notification) Notification: topic: error message: Node 'slave-01_controller' has gone away

On second attempt (via cli) this node was brought back by nailgun and deployment was started correctly