Hi rhdfranchising,
just thought i would share my upgrade notes also.
I had exactlythe same setup as you.. upgraded using expert method and same php version also.
I had exactly the same errors, but did not use the plugin you mentioned. However I was using the DARK template (set in the configuration) and in the plugin manager. I also had to enable the default template to have the user profiles and registration page appear.
I also had the same error when viewing members lists:
public_html/administrator/components/com_comprofiler/plugin.class.php on line 410
as soon as i enabled the default template in the plugin manager, it all came back! - so it appears that you MUST have the default template published in plugin manager and also publish the template that you want (your case LUNA and in mine DARK) then in configuration select your preferred template in there.
Job done.
Thanks to the team here for the upgrade, very professional!
Regards
E.