Error when trying to add another HostedEngine host

Issue

• When trying to add another host to a HostedEngine (RHEV) environment, we see the following error:

[ ERROR ] Failed to execute stage 'Setup validation': Metadata version 2 from host 25 too new for this agent (highest compatible version: 1)

• On the functioning host, we also see a similar error when trying to call the 'status' command, ie:

[root@rhevh01 ~]# hosted-engine --vm-status
Traceback (most recent call last):
  File "/usr/lib64/python2.6/runpy.py", line 122, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib64/python2.6/runpy.py", line 34, in _run_code
    exec code in run_globals
  File "/usr/lib/python2.6/site-packages/ovirt_hosted_engine_setup/vm_status.py", line 116, in <module>
    if not status_checker.print_status():
  File "/usr/lib/python2.6/site-packages/ovirt_hosted_engine_setup/vm_status.py", line 59, in print_status
    all_host_stats = ha_cli.get_all_host_stats()
  File "/usr/lib/python2.6/site-packages/ovirt_hosted_engine_ha/client/client.py", line 157, in get_all_host_stats
    return self.get_all_stats(self.StatModes.HOST)
  File "/usr/lib/python2.6/site-packages/ovirt_hosted_engine_ha/client/client.py", line 104, in get_all_stats
    stats = self._parse_stats(stats, mode)
  File "/usr/lib/python2.6/site-packages/ovirt_hosted_engine_ha/client/client.py", line 143, in _parse_stats
    md = metadata.parse_metadata_to_dict(host_id, data)
  File "/usr/lib/python2.6/site-packages/ovirt_hosted_engine_ha/lib/metadata.py", line 147, in parse_metadata_to_dict
    constants.METADATA_FEATURE_VERSION))
ovirt_hosted_engine_ha.lib.exceptions.FatalMetadataError: Metadata version 2 from host 25 too new for this agent (highest compatible version: 1)