Posted on: January 16, 2018, 08:57:09 AM
There is no such thing as a template extension. A template only loads files on the server and the only place in the admin that the files are called are on the template configuration screen.
If you have an entirely white page and you're getting this error, then you have a problem with your Joomla installation - the template has no way to effect any of that. We cannot debug a Joomla problem, our support is for our products. Is this a new installation of an older installation?