Undercloud install fails

Issue

• Snippet from undercloud install log.

^[[1;31mError: size(): Unknown type given at /etc/puppet/modules/heat/manifests/engine.pp:117 on node osp-director-mtc.mtc.com^[[0m
^[[1;31mError: size(): Unknown type given at /etc/puppet/modules/heat/manifests/engine.pp:117 on node osp-director-mtc.mtc.com^[[0m
+ rc=1
+ set -e
+ echo 'puppet apply exited with exit code 1'
puppet apply exited with exit code 1
+ '[' 1 '!=' 2 -a 1 '!=' 0 ']'
+ exit 1
[2016-12-14 11:23:11,975] (os-refresh-config) [ERROR] during configure phase. [Command '['dib-run-parts', '/usr/libexec/os-refresh-config/configure.d']' returned non-zero exit status 1]

[2016-12-14 11:23:11,976] (os-refresh-config) [ERROR] Aborting...
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 845, in install
    _run_orc(instack_env)
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 735, in _run_orc
    _run_live_command(args, instack_env, 'os-refresh-config')
  File "/usr/lib/python2.7/site-packages/instack_undercloud/undercloud.py", line 406, in _run_live_command
    raise RuntimeError('%s failed. See log for details.' % name)
RuntimeError: os-refresh-config failed. See log for details.
Command 'instack-install-undercloud' returned non-zero exit status 1

• The actual puppet manifest attempted to run:

[stack@osp]$ puppet agent -t /etc/puppet/modules/heat/manifests/engine.pp
Info: Creating a new SSL key for osp-director
Error: Could not request certificate: execution expired
Exiting; failed to retrieve certificate and waitforcert is disabled