There are several posts about Error:0 on the Joomla forum boards. They are all pointing to issues with third party extensions. Even though you are opening the template style, there are plugins that load on those pages.https://forum.joomla.org/viewtopic.php?t=915852
You would need to disable all third party extensions to see which is causing the problem.
Also, just to confirm I have a local copy of this running in 3.6.6 with no issues.