Jenking create RPMs failure

Hi I saw this jenking job failing more than once in the last day: 18:14:28 Triggered by Gerrit: http://gerrit.ovirt.org/27826 18:14:28 Building remotely on jenkins-slave-host01.ovirt.org in workspace /home/jenkins/workspace/ovirt-engine_3.4_create-rpms_merged@2 18:14:29 Fetching changes from the remote Git repository 18:14:29 Fetching upstream changes from git://gerrit.ovirt.org/ovirt-engine 18:14:47 Checking out Revision ccc3d4bd3c549f652724496b4c75bf2bb347fd9d (ovirt-engine-3.4) 18:14:47 Cleaning workspace 18:14:48 Resetting working tree 18:14:48 No emails were triggered. 18:14:48 Triggering fedora19 18:14:48 Triggering fedora20 18:14:48 Triggering centos6 18:15:39 fedora19 completed with result FAILURE 18:18:21 Configuration fedora20 is still in the queue: Waiting for next available executor on fedora20 22:55:54 fedora20 completed with result SUCCESS 22:55:54 centos6 completed with result SUCCESS 22:55:54 No emails were triggered. 22:55:55 Finished: FAILURE Can you fix that? Thanks, Oved