Mitaka packstack installation error

Hi,

On rhel 7.2, using sudo yum install -y https://repos.fedorapeople.org/repos/openstack/openstack-mitaka/rdo-release-mitaka-2.noarch.rpm
(as pointed by https://repos.fedorapeople.org/repos/openstack/openstack-mitaka/)
and following the instructions in https://www.rdoproject.org/testday/mitaka/milestone3/#how-to-test

[root@ga1 ~]# ll /etc/yum.repos.d/
total 84
-rw-r--r--. 1 root root 166 Apr 17 16:05 delorean-deps.repo
-rw-r--r--. 1 root root 218 Apr 17 16:05 delorean.repo
-rw-r--r--. 1 root root 209 Apr 17 16:59 rdo-release.repo
-rw-r--r--. 1 root root 157 Apr 11 10:43 rdo-testing.repo
-rw-r--r--. 1 root root 69124 Mar 28 07:00 redhat.repo

On # packstack --answer-file=...." I yet get the following error "
_mariadb.pp [ERROR]
...
Error: Puppet::Parser::AST::Resource failed with error ArgumentError: Could not find declared class ::galera::server at /var/tmp/packstack/"

Any ideas?

thanks
Gideon