Not able to add second host, hosted engine setup

Issue

• Trying to add a second host to my self hosted engine environment, but receiving the following error

[ INFO  ] Configuring VM
[ INFO  ] Updating hosted-engine configuration
[ INFO  ] Stage: Transaction commit
[ INFO  ] Stage: Closing up
[ INFO  ] Waiting for the host to become operational in the engine. This may take several minutes...
[ INFO  ] Still waiting for VDSM host to become operational...
[ ERROR ] The VDSM host was found in a failed state. Please check engine and bootstrap installation logs.
[ ERROR ] Unable to add slot-5b to the manager
[ INFO  ] Enabling and starting HA services
          Hosted Engine successfully set up
[ INFO  ] Stage: Clean up
[ INFO  ] Generating answer file '/var/lib/ovirt-hosted-engine-setup/answers/answers-20150428182105.conf'
[ INFO  ] Generating answer file '/etc/ovirt-hosted-engine/answers.conf'
[ INFO  ] Stage: Pre-termination
[ INFO  ] Stage: Termination

• /var/log/vdsm.log is full of python exceptions:

Thread-47::DEBUG::2015-04-28 18:20:02,837::fileSD::261::Storage.Misc.excCmd::(getReadDelay) /usr/bin/dd if=/rhev/data-center/mnt/10.1.1.2:_mnt_export_nfs_lv2___brq-setup/23c03bb6-9889-4cbf-b7ad-55b9a2c70653/dom_md/metadata iflag=direct of=/dev/null bs=4096 count=1 (cwd None)
Thread-47::DEBUG::2015-04-28 18:20:02,842::fileSD::261::Storage.Misc.excCmd::(getReadDelay) SUCCESS: <err> = '0+1 records in\n0+1 records out\n497 bytes (497 B) copied, 0.000312696 s, 1.6 MB/s\n'; <rc> = 0
Thread-47::ERROR::2015-04-28 18:20:02,845::domainMonitor::256::Storage.DomainMonitorThread::(_monitorDomain) Error while collecting domain 23c03bb6-9889-4cbf-b7ad-55b9a2c70653 monitoring information
Traceback (most recent call last):
  File "/usr/share/vdsm/storage/domainMonitor.py", line 250, in _monitorDomain
    self.nextStatus.hasHostId = self.domain.hasHostId(self.hostId)
  File "/usr/share/vdsm/storage/sd.py", line 483, in hasHostId
    return self._clusterLock.hasHostId(hostId)
  File "/usr/share/vdsm/storage/clusterlock.py", line 261, in hasHostId
    hostId, self._idsPath)
TypeError: argument 2 must be integer<k>, not str